#lambda graviton

[akrnd085]

AWS Lambda: Harnessing Serverless Computing

AWS Lambda graviton is a serverless compute service that runs your code in response to events and automatically manages the underlying compute resources for you. This article will explore the capabilities, use cases, and best practices for AWS Lambda, incorporating relevant examples and code snippets.

Understanding AWS Lambda graviton AWS Lambda allows you to run code without provisioning or managing servers. You can run code for virtually any type of application or backend service with zero administration. Lambda automatically scales your application by running code in response to each trigger.

Key Features of AWS Lambda Automatic Scaling: Lambda functions automatically scale with the number of triggers. Cost-Effective: You only pay for the compute time you consume. Event-Driven: Integrates with AWS services seamlessly to respond to events. Setting Up a Lambda Function 1. Create a Function: In the AWS Management Console, select Lambda and create a new function.

2. Configure Triggers: Choose triggers like HTTP requests via Amazon API Gateway or file uploads to S3.

3. Upload Your Code: Write your function code in languages like Python, Node.js, Java, or Go.

Example of a simple Lambda function in Python: import json

def lambda_handler(event, context):

print(“Received event: “ + json.dumps(event, indent=2))

return {

‘statusCode’: 200,

‘body’: json.dumps(‘Hello from Lambda!’)

} Deployment and Execution Deploy your code by uploading it directly in the AWS Console or through AWS CLI.

Lambda functions are stateless; they can quickly scale and process individual triggers independently.

Integrating AWS Lambda with Other Services Lambda can be integrated with services like Amazon S3, DynamoDB, Kinesis, and API Gateway. This integration allows for a wide range of applications like data processing, real-time file processing, and serverless web applications.

Monitoring and Debugging AWS Lambda integrates with CloudWatch for logging and monitoring. Use CloudWatch metrics to monitor the invocation, duration, and performance of your functions.

Best Practices for Using AWS Lambda Optimize Execution Time: Keep your Lambda functions lean to reduce execution time. Error Handling: Implement robust error handling within your Lambda functions. Security: Use IAM roles and VPC to secure your Lambda functions. Version Control: Manage different versions and aliases of your Lambda functions for better control. Use Cases for AWS Lambda Web Applications: Build serverless web applications by integrating with Amazon API Gateway. Data Processing: Real-time processing of data streams or batch files. Automation: Automate AWS services and resources management. Performance Tuning and Limitations Be aware of the execution limits like execution timeout and memory allocation. Optimize your code for cold start performance. Cost Management Monitor and manage the number of invocations and execution duration to control costs. Utilize AWS Lambda’s pricing calculator to estimate costs. Conclusion AWS Lambda graviton represents a paradigm shift in cloud computing, offering a highly scalable, event-driven platform that is both powerful and cost-effective. By understanding and implementing best practices for Lambda and incorporating ECS agents, developers can build highly responsive, efficient, and scalable applications without the overhead of managing servers. ECS agent enhance this infrastructure by enabling the seamless deployment and management of Docker containers, offering a flexible and efficient approach to application development and deployment. With Lambda and ECS agents working together, developers can leverage the benefits of serverless computing while ensuring optimal performance and resource utilization in containerized environments.

[pallavinovel]

Mastering AWS Certified Solutions Architect – Associate (SAA-C03)

Understanding the AWS Certified Solutions Architect

The AWS Certified Solutions Architect – Associate (SAA-C03) is a globally recognized certification that validates your ability to design secure, cost-effective, and scalable cloud solutions using AWS. It is ideal for IT professionals who want to build expertise in cloud architecture and best practices.

The AWS Solutions Architect Associate focuses on key areas such as AWS compute, storage, networking, security, and databases. Candidates learn how to design fault-tolerant architectures, optimize performance, and ensure high availability. Unlike other AWS certifications, this exam emphasizes real-world problem-solving with scenario-based questions.

Achieving this certification opens doors to roles like Cloud Architect, Solutions Engineer, and DevOps Specialist, making it a valuable asset for anyone pursuing a career in cloud computing.

Key Differences Between AWS SAA-C02 and SAA-C03

AWS replaced the SAA-C02 exam with SAA-C03 to align with the latest cloud technologies and best practices. Here are the main differences:

1. Increased Focus on Security & Best Practices

More emphasis on IAM policies, encryption techniques, and secure architecture design.

Expanded coverage of the AWS Well-Architected Framework for building reliable and efficient solutions.

2. Addition of New AWS Services

SAA-C03 includes AWS Graviton processors, AWS Global Accelerator, and Amazon FSx.

Greater focus on fault tolerance, high availability, and operational excellence.

3. More Real-World Scenario-Based Questions

The exam now tests practical problem-solving skills in designing cloud architectures.

Greater emphasis on cost optimization, performance efficiency, and scalability.

4. Exam Structure Remains the Same

Question format: Multiple-choice and multiple-response.

Time limit: No change in exam duration.

SAA-C03 ensures AWS professionals stay updated with the latest cloud advancements, making it essential for cloud architects.

AWS Services: Must-Know vs. Good-to-Know for SAA-C03

When preparing for the AWS Certified Solutions Architect – Associate (SAA-C03) exam, it's important to focus on critical services while also having a basic understanding of others. Here’s a breakdown:

Must-Know AWS Services (Core for the Exam)

These services are heavily tested and essential for designing scalable, secure, and cost-efficient architectures:

Compute: EC2, Lambda, Auto Scaling, Elastic Load Balancing (ELB)

Storage: S3, EBS, EFS, FSx

Networking: VPC, Route 53, CloudFront, AWS Global Accelerator

Databases: RDS, DynamoDB, Aurora, ElastiCache

Security & Identity: IAM, AWS Organizations, KMS, AWS Shield, AWS WAF

Monitoring & Management: CloudWatch, CloudTrail, AWS Config

Good-to-Know AWS Services (Helpful but Less Focused in the Exam)

These services may appear in some questions but aren’t the main focus:

Advanced Compute: AWS Outposts, EC2 Spot Instances, Batch

Big Data & Analytics: Athena, Glue, Kinesis, Redshift

Developer Tools: CodePipeline, CodeBuild, AWS SAM

Machine Learning & AI: SageMaker, Rekognition, Comprehend

Focusing on Must-Know services ensures better exam performance, while understanding Good-to-Know services helps in real-world AWS solutions.

Beyond Certification: Career Benefits of AWS Solutions Architect – Associate

Earning the AWS Certified Solutions Architect – Associate (SAA-C03) certification goes beyond just validating your skills—it boosts your career in cloud computing. It opens doors to roles like Cloud Architect, Solutions Engineer, and DevOps Specialist, with high demand across industries. AWS-certified professionals also enjoy higher salaries, often exceeding $120,000 annually, depending on experience and location. The certification enhances job security as more businesses migrate to the cloud. Additionally, it provides networking opportunities through AWS communities and events, helping professionals grow and advance. It also serves as a stepping stone to higher-level AWS certifications, ensuring continuous career progression in the cloud industry.

Read More: AWS Certified Solutions Architect

[systango-technologies]

How is AWS Graviton Redefining Cloud Performance and Cost Efficiency for Business Leaders?

With over 90% of businesses migrating to the cloud, the demand for cost-efficient and scalable cloud solutions has never been more critical to staying competitive. AWS Graviton, an ARM-based processor developed by AWS, is transforming cloud computing with its focus on delivering high performance at reduced costs. Designed to meet the demands of modern workloads, AWS Graviton empowers businesses to optimise resource usage without compromising efficiency.

This blog will explore the unique benefits of AWS Graviton, its role in transforming cloud strategies, and how AWS Cloud Services amplifies its impact on decision-makers and tech leaders.

I. What is AWS Graviton?

II. AWS Graviton: Features, Business Benefits, and Industry Use Cases

AWS Graviton processors combine cutting-edge technology with significant business advantages, making them a transformative tool for modern enterprises. Below is an overview of key features, the associated business benefits, and real-world examples showcasing their impact.

1. Strong Performance

Feature Details

Graviton processors, built on ARM architecture, deliver exceptional computational power across diverse workloads such as machine learning (ML), media processing, and microservices.

Business Benefits

Faster execution times for applications, improving user satisfaction.

Enhanced responsiveness during high-demand periods, ensuring business continuity.

Example

Lyft utilised Graviton2 instances to optimise the performance of its ride-hailing services. This resulted in reduced processing delays during peak hours, ensuring seamless ride-matching and better user experiences.

2. Cost Optimisation

Feature Details

Graviton-powered EC2 instances are priced 20–40% lower than traditional x86-based options, offering comparable or better performance.

Business Benefits

Reduced operational costs, enabling reinvestment in innovation.

Improved financial flexibility for startups and cost-sensitive businesses.

Example

Snap Inc. saved up to 40% in cloud expenses by migrating to Graviton2 instances while maintaining robust application performance for Snapchat’s millions of users.

3. Energy Efficiency

Feature Details

Graviton processors consume less energy due to their optimised ARM design, supporting businesses’ sustainability initiatives.

Business Benefits

Lower power consumption reduces utility costs.

Alignment with ESG goals, enhancing brand reputation and stakeholder trust.

Example

Netflix deployed Graviton instances for its video streaming workloads, cutting energy use and advancing its carbon-neutral goals without compromising streaming quality.

4. Flexibility and Scalability

Feature Details

Graviton integrates seamlessly with AWS services like Lambda, EC2, and Fargate, enabling efficient scaling for diverse workload demands.

Business Benefits

Easy adaptation to fluctuating workloads, reducing downtime risks.

Flexibility to innovate with serverless applications and global-scale platforms.

Example

Intuit scaled its QuickBooks platform during tax season using Graviton-based instances, handling increased traffic while maintaining smooth user experiences.

5. Advanced Security and Compatibility

Feature Details

Graviton processors include hardware-based protections against vulnerabilities and are compatible with widely used frameworks like MySQL, PostgreSQL, and Apache Spark.

Business Benefits

Enhanced security ensures compliance with industry standards, particularly in regulated sectors.

Smooth migration paths for existing workloads without the need for extensive rewrites.

Example

Redis Labs leveraged Graviton instances to secure database queries while improving client analytics response times, benefiting industries with real-time data needs.

6. Optimised for ML Workloads

Feature Details

Graviton offers a better price-to-performance ratio for ML model training and inference, enabling faster development cycles.

Business Benefits

Cost-effective scaling of AI/ML applications.

Shorter time-to-market for AI-driven innovations.

Example

Pinterest used Graviton2 instances to boost its recommendation systems, resulting in improved user engagement and personalisation for its platform.

Here’s a quick summary for decision-makers:

Business Takeaway

AWS Graviton provides a compelling combination of performance, cost efficiency, and sustainability, making it a preferred choice for businesses across industries. By adopting Graviton, enterprises can achieve operational excellence, enhance customer satisfaction, and meet sustainability goals.

III. AWS Graviton vs Intel: A Quick Comparison

Comparing AWS Graviton with Intel-based instances provides a clearer perspective for decision-makers:

Cost Efficiency: AWS Graviton instances offer 20–40% cost savings, making them a preferred choice for cloud-native workloads.

Performance: Graviton delivers up to 40% better performance for compute-intensive tasks like machine learning, while Intel shines in legacy applications needing x86 architecture.

Compatibility: Intel processors have extensive software support, but Graviton’s ARM-based architecture is optimised for modern, scalable workloads.

Energy Efficiency: AWS Graviton outperforms Intel in power efficiency, aligning with businesses focused on sustainable practices.

This comparison highlights AWS Graviton as the future-ready option for businesses seeking cost and energy efficiency while modernising their infrastructure.

IV. AWS Graviton in the Bigger AWS Ecosystem

AWS Graviton is not just a processor; it’s a vital component of the larger AWS Cloud Services ecosystem, empowering businesses to achieve operational excellence across computing, storage, and networking. Its integration capabilities make it a cornerstone of modern cloud strategies.

To read full blog visit — https://www.systango.com/blog/how-is-aws-graviton-redefining-cloud-performance-and-cost-efficiency-for-business-leaders

[elgaberino-mcoc]

MCOC Wishlist Poll Snapshot: Entire Rankings

001 Mystique 002 Quicksilver 003 Beta Ray Bill 004 Sandman 005 Adam Warlock 006 Kitty Pryde 007 Lizard 008 Morbius the Living Vampire 009 Kraven the Hunter 010 Cloak & Dagger 011 Spider-Man 2099 012 Black Cat 013 Bullseye 014 Jessica Jones 015 Ares 016 Shang-Chi 017 Gladiator (Kallark) 018 Baron Zemo 019 Lady Deathstrike 020 Enchantress 021 Valkyrie MCU 022 Knull 023 Morgan le Fay 024 Scorpion 025 Captain Britain 026 Galactus 027 Dazzler 028 Silver Samurai 029 Black Knight 030 Dracula 031 Hobgoblin 032 Pyro 033 Fantomex 034 Spider-Woman 035 Jean Grey 90s 036 Silk 037 Polaris 038 Silver Sable 039 Sif 040 Anti-Venom 041 Mister Negative 042 Crystal 043 Legion 044 Shocker 045 Malekith the Accursed 046 Destroyer Armor 047 M'baku the Man-Ape 048 The Mandarin 049 Emplate 050 Multiple-Man 051 Shuri 052 Banshee 053 Onslaught 054 Warpath 055 Sunfire 056 Cannonball 057 Dark Phoenix 058 Blue Marvel 059 Prowler (Aaron Davis) 060 Okoye 061 Mockingbird 062 Spiral 063 Madame Hydra / Viper 064 Hydro-Man 065 Red She-Hulk 066 Agent Anti-Venom 067 Blackheart 068 Gorr the God-Butcher 069 Songbird 070 Quasar 071 Absorbing Man 072 Whiplash 073 Armor 074 Daimon Hellstrom 075 Wendigo 076 Nimrod 077 Graviton 078 Gwenom 079 Deathlok 080 Firestar 081 Vulcan 082 Wonder Man 083 Selene 084 Blob 085 Klaw 086 Rachel Summers 087 Thor (MCU Stormbreaker) 088 Shadow King 089 White Tiger 090 Tombstone 091 Jack O'Lantern 092 Valkyrie Classic 093 Toad 094 Moonstone 095 Weapon H 096 Jocasta 097 Dani Moonstar 098 Monica Rambeau 099 Wolfsbane 100 Franklin Richards 101 Ancient One 102 Arnim Zola 103 Exodus 104 Forge 105 Supergiant 106 Madelyne Pryor 107 Hank Pym 108 Hawkeye (Kate Bishop) 109 Negasonic Teenage Warhead 110 Spider-Man Noir 111 Phantom Rider 112 Blink 113 Sebastian Shaw 114 Clea 115 Black Tom Cassidy 116 Kurse 117 Danger 118 Daken 119 Omega Sentinel 120 Grim Reaper 121 Radioactive Man 122 Shatterstar 123 Darkstar 124 Werewolf by Night 125 Hope Summers 126 The Magus 127 Union Jack 128 Captain Marvel (Mar-Vell) 129 Crimson Dynamo 130 Pixie 131 Conan 132 Scarlet Spider (Ben Reilly) 133 Azazel 134 Jigsaw 135 Boom-Boom 136 Swarm 137 Xorn 138 Machine Man 139 Black Widow (Yelena Belova) 140 Madame Masque 141 Misty Knight 142 Chamber 143 Mistress Death 144 Skaar 145 Morlun 146 Thanos (Endgame) 147 Leader 148 Sleepwalker 149 Deacon Frost 150 Black Swan 151 Agent 13 (Sharon Carter) 152 Fin Fang Foom 153 Ka-Zar 154 Arcade 155 Iron Spider 156 Dust 157 Gorgon 158 Lash 159 Namora 160 A-Bomb (Rick Jones) 161 Ikaris 162 Nick Fury (Classic) 163 Rescue 164 Nico Minoru 165 Volstagg 166 Weapon Hex 167 Stingray 168 Maximus the Mad 169 Cyttorak 170 Skurge the Executioner 171 Doc Samson 172 Maverick / Agent Zero 173 Sauron 174 Baron Blood 175 Captain America Falcon 176 Wong 177 Mantis 178 Whirlwind 179 Firelord 180 Magma 181 Molecule Man 182 White Fox 183 Nova (Sam Alexander) 184 Satana 185 Dum Dum Dugan (LMD) 186 Holocaust 187 Shiklah 188 Valkyrie Moonstar 189 High Evolutionary 190 Bloodaxe 191 Magus (Technarch) 192 Nighthawk 193 Punisher: War Machine 194 Goliath (Bill Foster) 195 Nova (Frankie Raye) 196 Ghost Rider (Danny Ketch) 197 Dr. Cecilia Reyes 198 Sentinel X (Shogo Lee) 199 Thena 200 Hellcat 201 Cosmic Spider-Man 202 Attuma 203 Shroud 204 Doctor Nemesis 205 Siryn 206 Nate Grey 207 Iron Monger 208 Black Mamba 209 Agent Carter 210 Kluh 211 Tiger Shark 212 Purple Man 213 Snowbird 214 Ice-Thing 215 Lilandra 216 Superior Spider-Man 217 Thane 218 Moon Girl & Devil Dinosaur 219 Jackal 220 Jean Grey (X-Men Red) 221 Punisher: Frankencastle 222 Puck 223 Rockslide 224 Red Ghost and his Super-Apes 225 Deathbird 226 Hydra Supreme 227 Strong Guy 228 Zarda the Power Princess 229 Sage 230 Quentin Quire (aka Kid Omega) 231 Prowler (Hobie Brown) 232 Slapstick 233 Stardust (Lambda Zero) 234 Titanium Man 235 D'spayre 236 Colleen Wing 237 Thunderbird (John Proudstar) 238 Iron Maiden 239 Gorilla-Man (Kenneth Hale) 240 Jack of Hearts 241 Titania 242 Avalanche 243 Toxic Doxie 244 Death’s Head 245 Impossible Man 246 Worthy Captain America (Mjölnir/Endgame) 247 Outlaw (Higgins) 248 Scarlet Spider II (Kaine Parker) 249 Beetle 250 Typhoid Mary 251 Bloodscream 252 Serpent (Cul Borson) 253 Ms. America Chavez 254 Ghost Rider (Reyes) 255 Hummingbird 256 Mercury 257 M (Monet St. Croix) 258 Black Tarantula 259 Spitfire 260 Wizard 261 Superior Octopus 262 Maria Hill 263 Minotaur (Dario Agger) 264 Echo 265 Morph 266 Karolina Dean 267 Zarathos 268 Thundra 269 Smasher (Kane) 270 Hyperstorm 271 Boomerang 272 Stature (Cassie Lang, AKA Stinger) 273 Meggan 274 Caliban 275 Hollow 276 Abyss (Styger) 277 Silverclaw 278 Red King 279 Doctor Druid 280 U.S. Agent 281 Sersi 282 Molten Man 283 Zzzax 284 Singularity 285 Agatha Harkness 286 Blastaar 287 Korvac 288 Citizen V 289 Carter Slade the Satan-Stomper 290 Post 291 Shuma-Gorath 292 Sin 293 Triton 294 Quasar (Kincaid) 295 Martinex 296 Iron Man (Mark I) 297 Wiccan 298 Speedball 299 Paladin 300 Amanda Sefton 301 Overmind 302 Diamondback (Rachel Leighton) 303 Feral 304 Charlie-27 305 Rom: Spaceknight 306 Juggerduck 307 The Uranian 308 Blazing Skull 309 Starfox 310 Living Laser 311 Hiro-Kala 312 Namorita 313 Jack Flag 314 Stormborn 315 Doctor Bong 316 Crescent & Io 317 Gamora mcu 318 Wave 319 Ironheart 320 Venom Rocket 321 Doctor Spectrum 322 Davos the Steel Serpent 323 Lady Hellbender 324 Falcon classic 325 Bloodstorm 326 Tempus (Eva Bell) 327 Voyager 328 No-Name the Brood 329 Demon Bear 330 Moondragon 331 Arachne 332 Aero 333 Andromeda 334 Speed Demon 335 Phyla-Vell 336 Xemnu the Living Hulk 337 Aleta 338 Araña 339 Human Torch (Jim Hammond) 340 Constrictor 341 Iso 342 Arkon 343 Genis-Vell 344 Shanna the She-Devil 345 Volcana 346 Batroc the Leaper 347 Arclight 348 Scientist Supreme 349 Yukio 350 N'kantu the Living Mummy 351 Gentle 352 Caiera the Oldstrong 353 Beetle (Janice Lincoln) 354 Penance (Baldwin) 355 Super-Adaptoid 356 Ajak 357 Future Colossus 358 Moses Magnum 359 Vampire by Night 360 Superia 361 Puppet Master 362 Chimera 363 Count Nefaria 364 Stick 365 Hellion 366 Agent May 367 Mister Hyde 368 Spot 369 Cobra 370 Doop 371 Lyja 372 Wrecker 373 Stargod/Man-Wolf 374 Stilt-Man 375 Machinesmith 376 Spider-Bitch 377 Madame Web 378 Corsair & Sikorsky 379 Thor (Groot) 380 Balder 381 Random 382 Power Man (Alvarez) 383 Starhawk 384 Sun-Girl (Selah Burke) 385 Arcanna 386 Scream 387 Kree Sentry 388 Agent Phil Coulson 389 Thunderstrike (Kevin) 390 Talos 391 Carmilla Black 392 Uatu 393 Jennifer Kale 394 Warwolf 395 Enigma (Aikku Jokinen, AKA Pod) 396 Belasco 397 Swordsman 398 Trevor Fitzroy 399 Dazzler Thor 400 Hepzibah 401 Atlas 402 Ogun 403 Yellowjacket (DeMara) 404 Hala the Accuser 405 Entropy 406 War Machine (Infinity War) 407 Animax 408 Captain Universe 409 Whizzer 410 Hogun the Grim 411 Cottonmouth (Clemens) 412 Blizzard 413 Storm (Queen of Wakanda) 414 Silhouette 415 Immortus 416 Beast (Hex-Men) 417 Solo 418 White Rabbit 419 Aurora 420 Equinox 421 Hellcow 422 Owl 423 Arsenic & Old Lace 424 Beetle mk iii 425 Valeria (Age of Conan) 426 Trapster 427 Throg 428 Mimic 429 Hulkling 430 Iron Lad 431 Angel (Black Vortex) 432 Marionette 433 Phastos 434 Hobgoblin 2099 435 Razor Fist 436 Asp 437 Baymax 438 Captain America (Peggy Carter) 439 Sp//dr 440 Tarantula (Kaine) 441 Silver Scorpion (Barstow) 442 Midnight Angels of Wakanda 443 Demolition Man 444 White Wolf (Hunter) 445 Synapse 446 Kingo 447 Grey Gargoyle 448 Gilgamesh the Forgotten One 449 Justice 450 Atlas Bear 451 Iron Fist (Orson Randall) 452 Victorious 453 Lincoln Campbell 454 Luna Snow 455 Zadkiel 456 Crystar 457 Husk 458 Gravity 459 Kaecilius 460 Marrina 461 Ghost Rider (Circle of Four) 462 Nighthawk Supremeverse 463 Fixer 464 Cardiac 465 Capwolf 466 Kull the Conqueror of Atlantis 467 Noh-Varr 468 Korath the Pursuer 469 Miss America (Joyce) 470 Blackjack O'Hare 471 Bi-Beast 472 Vance Astro 473 Bushmaster (Quincy) 474 Krugarr 475 Poundcakes 476 Yo-Yo 477 American Son 478 Mister M 479 Cottonmouth (Stokes) 480 Manphibian 481 Infamous Iron Man 482 Paibok the Power-Skrull 483 Shatter 484 Daredevil Shadowland 485 Nakia 486 Garrison Kane 487 Makkari 488 Elloe 489 Northstar 490 Spiderling 491 She-Hulk (Lyra) 492 Proteus 493 Grey Hulk 494 Doorman 495 Toro 496 Nuke 497 Acroyear 498 Blonde Phantom 499 Drax MCU 500 Orrgo 501 Marvel Girl NPC 502 Fandral the Dashing 503 Spider-Girl 504 Ms. Thing 505 Captain America 2099 506 Veranke 507 Haechi 508 Mulholland Black 509 Mighty Destroyer 510 Eclipse 511 Powell McTeague 512 Druig 513 Copycat 514 Terror 515 Ahab 516 God-Emperor Doom 517 Doombot (V Series) 518 Sword Master 519 Cyclone 520 Black Mariah 521 Zenzi 522 Thor: Herald of Thunder 523 3-D Man 524 Hulk Endgame 525 Tetu 526 Doctor Octopus (Liv Octavius) 527 Margali 528 Molly Hayes 529 Sinara 530 Aldrich Killian 531 Goldballs 532 Mindless Ones 533 Nikki Gold 534 Foolkiller 535 Darkwing Duck 536 Thunderstrike (Eric) 537 She-Thing (Ventura) 538 Killmonger (Emperor Symbiote) 539 Iron Duck 540 Ms. Marvel II (Ventura) 541 Spymaster 542 Scalphunter 543 Spider-Man (Miles Morales Movie) 544 Karn 545 Gun-R 546 Terminus 547 Achebe 548 Llyra 549 Bushmaster (John) 550 Sugar Man 551 Great Lakes Avengers 552 Xarggu 553 Human Fly (Deacon) 554 Shogun 555 Plantman 556 Brawn 557 Elixir 558 Litterbug 559 Smasher (Rokk) 560 Bug 561 Mammomax 562 Synch 563 Anaconda 564 Wolvie 565 Dirk Anger 566 Captain [****] 567 Ezekiel 568 Diamondback (Stryker) 569 Unworthy Thor 570 Master Mold 571 Masked Marauder 572 M.O.D.A.M. 573 Hellsgaard 574 Hulkbuster 2.0 575 Forgetmenot 576 Ghaur 577 Arcturus Rann 578 Ultimate Green Goblin (Movie) 579 Dragoness 580 Porcupine 581 M-11 582 Taskmaster MCU 583 Dansen Macabre 584 Lady Bullseye 585 Harpoon 586 Unicorn 587 Bushwacker 588 Loki variant 589 Night Nurse 590 Psyklop 591 Mack 592 Eel 593 Water Snake 594 Chaos King 595 Red Hulk (Maverick) 596 Kaluu 597 The Russian 598 Geena Drake 599 Jimmy Hudson 600 Slayback 601 Mentallo 602 Skull the Slayer 603 Karkas 604 Dominic Fortune 605 The Buzz 606 Doctor Crocodile 607 Ox 608 Dorrek VII 609 Needle 610 Krang 611 Dino-Thor 612 Stegron 613 Zeitgeist 614 [VACANT] 615 [VACANT] 616 [VACANT]

[sanguineshade]

Today on: lessons from challenge mode

Carl: It takes two to tango, so you better start holding D.

Taokaka: Jump, JUMP, JUMP, MEOOOOW!!!

Ragna: You can either be good at Inferno Divider or Carnage Scissors, but not both.

Naoto: Kick, kick, punch, repeat!

Kokonoe: Stop wasting the damn Gravitons.

Arakune: If you breathe with your left nostril a little harder than usual it's a completely different move.

Lambda used Swords Dance.

Hazama: Calm and focus. Every input must be deadly and precise.

Terumi: You start kicking and you don't stop kicking and you stab them a bunch, it'll work itself out in the end.

[mystech-master]

Blazblue Drives

Okay so I have been thinking about the Drives in Blazblue a lot, probably WAY more than I should.

pointless idea/rambling bellow for those who even care

In game, the Drives are described as “ an individual ability per character that can be activated by pressing the D button. It is a system where every character has one unique ability or mechanic during gameplay. Activating Overdrive will generally enhance this ability for that character.”

In Lore, they are described as “ the materialization of a soul’s power, made via the power of the Azure.” IMO, that sounds very similar to the Semblances from RWBY.

So what Drives to characters have in-game that could ALSO be their in story Drives.

Ragna: Soul Eater is not his actual Drive, rather it is the result of the Azure Grimoire’s power.

Jin: Frost Bite is simply Jin using Yukianesa’s power, as show in his battle with Tsubaki in CS’ story doesn’t allow you to use Drive attacks when Yukianesa isn’t working in-story. This is the first kind of non-story Drive, which I shall refer to as an “Equipment Drive” where the Drive is simply a character using their weapon/object of power they have.

Noel: Chain Revolver involves her chaining (ha) together attacks, this is more of a “Technique Drive”, which I shall use to refer to a Drive that could simply be look at as that character’s own fighting style/technique..

Mu-12: As Mu IS Noel, she should have the same Drive, but NOPE. Steins Gunner has her place floating laser turrets. Now this COULD be seen as an equipment Drive, but I could also see it being just a function she’s unlocked as being “The Kusanagi”. So kind of in the middle about this

Rachel: Our first official Drive user. Silpheed allows Rachel to control the wind. Not it isn’t wind magic, it’s her Drive, but she DOES have Lighting magic.,

Taokaka: Her Drive is Dancing Edge, which makes her launch in a torpedo like fashion towards her foes. Now this could simply be her pouncing, but looking at her Overdrive ‘Almost Becoming Two! Meow!” she seems to be moving so fast she creates an afterimage which allows her to attack twice. So her Drive could basically allow her super speed.

Carl: His Automaton Drive is simply him manipulating Nirvana. So that makes it an Equipment Drive

Litchi: Same with Litchi and her Mantenbō, it’s just her controlling her staff.

Arakune: His Crimson Drive could work.  He builds up his curse gauge and then summons bugs. I get a real Plague of Egypt vibe with this. So yeah, bug curse COULD work as an actual in story power.

Tager: His Voltic Battler Drive could simply be him using his Electromagnetism. I mean come on S7 is supposed to be the Science > Ars Magus/Magic team, or course Tager’s not gonna use an actual Drive.

Bang: Burning Heart makes Bang deliver flaming attacks which charge up his “Fu-Rin-Ka-Zan” meter. The flaming attacks could be it honestly.

Hakumen: His Slaying God Drive, is a block followed by a counter attack. Very much a “Technique Drive”, seeing as that could just be his fighting style.

Nu-13: Sword Summoner is either an acutal Drive, or just a Murakumo function, much like Mu’s thing.

Valkenhayn: His Werwolf Drive could simply be him using his Lycanthrope blood. It is simply his magic at work, as his species was made by magic, much like another character down the line.

Jubei: He is fairly new and I don’t really get his Drive, so this is a bit iffy. His Shiranui Drive (or Sea Fire when Translated/localized), according to the wikia is “A slashing attack that crosses up and leaves a black mark on the opponent, which eventually disappears.” Apparently this mark allows him to warp behind the opponent during two of his DDS. I have no idea how this could be made in story.

Tsubaki: She has two, which makes no sense (as her Tsubaki and Izayoi forms), First, her Install Drive is her charging up the Install gauge. Which could simply be the Izayoi charging up, I recall the way that she gets her bad ending sin CS, is to use Drive Attacks which means her overusing the Izayoi and thus dying. As Izayoi (who is the same person thus has the same soul and thus should have the same Drive) her Drive is Gain Art, which basically activates flight mode (also Gain Art apparently has like 3 other meanings in Blazblue, so there’s that crap).

Makoto: Her Impact Drive allows her to charge attacks, I think I heard somewhere that Impact was the name of her tonfa (which she uses like gloves/gauntlets for some reason so what do we classify them?). So, Equipment Drive.

Hazama: Ouroboros is him using his Nox, Equipment Drive.

Terumi: Force Eater, from what I’ve read on the wikia, his attacks increase the Heat Gauge w/o giving any heat to the opponent. Not too sure how this could be in story.

Kokonoe: her Drive is her Graviton, which is just her using another gadget. Like Tager, she is Team Science so she might HAVE a drive, but she refuses to use it.

Lambda: Much like Nu, Sword Summoner Revision could either be her Drive, or just her Murakumo-ness.

Platinum: Just her using Muchōrin, Magical Symphony is her summoning things using the Nox’s power to materialize matter.

Relius: Now he not only has a game Drive, but he also has a Story Drive. In Game he has Detonator which summons Ignis, so he has an Equipment Drive like Carl. But apparently, his real Drive is what allows him to create all those Marionette arms.

Nine: Her Drive, The Abyss Diver, is just her using Magic. Magic is not a Drive.

Izanami: She IS a Drive so this probably isn’t one, but she seems to be enough of her own person, IDK. Her Sand Shine <Exodus Ark> Drive lets her shoot that halo thing on her back. So I GUESS its an Equipment Drive.

Bullet: Her Lock On Drive lets her target and launch at opponents, which increases her Heat Level. In my mind, this is almost an opposite of Yang’s Semblance from RWBY. Increasing strength the more you hit someone, unlike Yang who gets stronger the more SHE gets hit.

Amane: I THINK his Drive is an Equipment Drive, his Spiral Drive has him drill his opponent with his ribbons, but all of hid attacks are shifting his ribbons into shit.

Celica: Her Drive Minerva is her just using the bot, Equipment Drive. She has Healing Magic anyways

Hibiki: His Double Chase could be very similar to Blake’s Semblance from RWBY, creating a shadowy double.

Kagura: Black Gale is just switching stances, Technique Drives

Es: Her Crest Arts COULD be a Drive (I do not feel like explaining the difference between the Drives of the o.g. series, and the XBlaze series), as it says her sword’s massive sheathe absorbs Seither, those Crests could just be made of the seithr it absorbs, so it COULD be an Equipment Drive.

Naoto: he canonically has the Bloodedge Drive. He’s good.

Susano’o: His Drive, God of Military Arts, has him unlock his attacks. Not too sure how this could go in story as a Drive. Plus he’s a god, he doesn’t need a Drive.

AND THAT is everyone. Those are the characters who have Drives that are either JUST gameplay or could be in Story Drives.

So tell me, if you could give a character a Drive IN-LORE, what would you give them.

[takepara]

なるほどですね

(全 71 件)

1. ゴールが見えなくなったプロジェクトに立ち向うときに必要なたった１つのこと

2. サービス特性にあった検索システムの設計戦略

3. サポート終了を迎えたWindows Server用アプリケーションの延命を支援する新しいプログラム

4. 「Lambda-RDS」パターンももう怖くない！？フェイルオーバーももっと早くなるよ！ RDS Proxyがプレビュー公開されました！#reinvent

5. [レポート] Webアプリのための多層防御アプローチ – re:Invent 2019 #SEC407 #reinvent

6. [レポート] Amazon S3＆FSx for Lustre：高性能ファイルストレージの詳細 #STG307 #reinvent

7. 政治家の「何か言っているようで、何も言っていないコミュニケーション」を馬鹿にしてはいけない。あれは凄い。

8. 【AWS Transfer for SFTP】WinSCPを使用してファイル転送する

9. re:Invnet 2019 12月3日のまとめ

10. Amazon Athena でデータがパーティション分割されていないログを分析する

11. JavaScript ASTを使ったツール(自作、ESLint、Babel、jscodeshift)を実装する話

12. Dive into AST

13. わいのNuxt.jsアプリケーションは遅かった。

14. Yahoo! JAPAN トップページを Atomic Design と React・Redux・TypeScript で作り変えたお話

15. AWSサーバレスでWebSocketを使ったWEBチャットを作ってみます！

16. AWS Launches &amp; Previews at re:Invent 2019 – Tuesday, December 3rd

17. AI搭載の超スマート歯ブラシ「Oclean X Pro」はジャイロを使って磨き残しを防止！

18. AWS、超高性能なクラウド基盤を実現するために独自開発した技術を説明。AWS re:Invent 2019

19. ［速報］AWS、自身でプロセッサを開発していく姿勢を明らかに。独自開発の第二世代ARMプロセッサ「Graviton 2」発表。AWS re:Invent 2019

20. まもなく登場 – Graviton2プロセッサ搭載の汎用、コンピューティング最適化、メモリ最適化インスタンス

21. マイクロソフトのログインシステムのバグによるアカウント乗っ取りの危機

22. 運転中のスマホ使用をAIカメラで検知、取り締まり強化--豪州で

23. ベルシステムズ24、コールセンター業務に「HoloLens 2」を活用

24. 強調スニペットにFAQリッチリザルトを表示している英国政府サイト

25. 松本人志の「薬物厳罰化」発言が何から何まで間違っている理由

26. 社内slackにVIPチャンネルを作った話

27. ソレドコ

28. 権限移譲する技術

29. ダイアモンド・ユカイ「免許返納に納得しないおふくろ。オレがとった最終手段は」

30. JR東日本が「QR自動改札機」、2020年春開業の高輪ゲートウェイ駅で実験

31. 角川文庫・ラノベ 読み放題｜１万冊以上のライトノベル・文庫が月額760円(税抜)から読み放題！電子書籍ならBOOK☆WALKER

32. 徐々に進む「ソシャゲ離れ」、引退を決意したユーザーたちの声

33. HPEのサーバー向けSAS SSD、稼働32,768時間超えで障害発生

34. 子どものインターネット利用制限の是非を問う。ネット世界のリスクと可能性

35. IoTが“空気清浄”という体験をネクストレヴェルへ：PARTY伊藤直樹が体験した新たなるAIRMEGAの実力

36. New – Provisioned Concurrency for Lambda Functions | AWS News Blog

37. Using Amazon RDS Proxy with AWS Lambda

38. Chrome Dev Summit 2019: ともにウェブを進化させる

39. 標準技術に携わるメリットや標準化活動のヒント

40. Leo and Topics

41. 【LINE】iOS13でLINEの着信が鳴らない、着信画面が表示されず不在着信になる不具合

42. Fastly’s new changelog makes it easier to track API enhancements

43. トレーニングの常識を変える最先端EMSスーツが登場

44. Announcing UltraWarm (Preview) for Amazon Elasticsearch Service

45. AWS Outposts Now Available – Order Yours Today!

46. New – Amazon Managed Apache Cassandra Service (MCS)

47. Amazon Managed Apache Cassandraサービス（MCS）がアナウンスされました

48. 2段階認証でも突破する詐欺サイトが急増　作成ツール出回る (1/2)

49. スピン経済の歩き方：結局、大型ショッピングモールは街を生かすのか、殺すのか (1/6)

50. 「50GB 900円」──楽天モバイル、MNOプランの価格が流出？　Googleキャッシュ上に残された謎のページ

51. さよなら本番サーバー

52. productionやdevelopment、stagingという言葉の使い分けについて

53. RustとGoでWebAssemblyのファイルサイズを比較する

54. 環境変数を設定するだけでRuby on Railsサーバが10%高速化する(かもしれない)話

55. RailsでTZ環境変数を設定するハックを不要にした話

56. AWS Outpostsが一般提供開始になりました　今すぐご注文ください！

57. [レポート] モノリシックなシステムをサーバーレス化するための8つのステップ API310-R How to refactor a monolith to serverless in 8 steps #reinvent

58. [レポート] Amazon Prime Videoはどのように大量トラフィック（全USの8%！）を処理しているのか #reinvent #ANT348

59. [速報] UltraWarm新登場！Elasticsearch Serviceのコストを90%削減！？ #reinvent

60. [速報] AWSのマネージドCassandra、分散KVSのAmazon MCSが発表されました！ (Open Preview) #reinvent

61. [速報] AWS Accelerated Site to site VPN Connectionsがリリースされました！ #reinvent

62. [速報] AWS Local Zones が発表されました！ #reinvent

63. [速報] コードレビューの自動化！パフォーマンスやコストの最適化まで出来ちゃう Amazon CodeGuru が発表されました！#reinvent

64. [速報] マシンラーニングを使ったエンタープライズのための検索サービス「Kendra」が発表されました #reinvent

65. [速報]コールセンター業界に革命が起こる！？Contact Lens for Amazon Connectが発表されました！ #reinvent

66. [速報]AWSのインフラを5Gのエッジで動かす！新サービスAWS Wavelengthが発表されました #reinvent

67. AWS Outpostsのよくある疑問についてまとめてみた #reinvent

68. [レポート] アマゾンの回復性のあるシステムを作るアプローチ DOP342 #reinvent

69. [速報] 革新的な新しいハードウェアアクセラレーションキャッシュで他DWHよりも最大10倍高速化！ AQUA(Advanced Query Accelerator) for Amazon Redshift が発表されました #reinvent

70. [レポート]CI / CDはWagを助ける！リリースプロセスを600％削減 #DOP205 #reinvent

71. re:Invent2019のEXPOでAWS Outpostsの実機が展示されていました！ #reinvent

[perfect-corroscience]

Chapter 33: The Departed

Finally, some free time inbetween my upcoming final and a break before summer courses/work... 

“But why take up arms against their own kind?”

In the last chapter, the Oxsecian king was forced to make the painful decision of authorizing Operation Neogenesis – where some will depart in hopes of another world while the rest stay behind to combat the Animata. There was a brief moment of levity in Princess 36AIS’ birth. That won’t last.

33-1 It’s a declaration of war. Revolution is here.

              The Oxsecian ship, 6 seconds before destruction…

              The king gazes around the evacuated ship.

              “Just live to fight another day… It’s true I believed that at the time. Until that moment, that is.”

It’d be too optimistic to expect everyone to be okay with this, even if everyone staying behind on the Oxsecian homeland was fine with their sacrifice. So, a rebellion sets up the field for this chapter.

Enemies will be a mix of Bow and Staff, but they’ll mostly be Lightning attribute and will absorb it as well. Sword, Darkness and Graviton units are the way to go. These Shock Lasers also have that suicide attack for when they get low on health and

Yeah, that Shock Laser nearly took out 2/3rds of my team! For reference, Puprope^ was level 81, Sheena 74, Korin and Bahl 90  - as you can see, Bahl had some lightning resistance too. 

You’ll definitely want to bring some units with Anti-Lightning Capsules; if you’re lacking in units like those, Lightning Visors and Helmets are otomo drops in 8-6 and 22-6 and can be upgraded to Lightning Shields (Anti-Lightning Shield, Self at 20% reduction for 2 turns) or Radiant Shields (30% Lightning damage reduction for 2 turns).

I swapped Rikken out after this stage for Seiryu^. It wasn’t there at the time, but as of this writing, Seiryu had got an Omicron otomo that lets him spawn anti-lightning capsules (obtainable from the trading post), making him/his lambda well worth bringing.

The stages will also mainly be compounded by these barriers being everywhere; they block chains and make movement a bit annoying.

33-2 “She’s missing, sire. Princess 36AIS is nowhere to be found.”

And you, if you aren’t careful.

There’ll be Oxsecian enemies, too, naturally.

33-3 The eyes of the rebels smolder with anger and hatred.

The eyes of the rebels smolder with anger and hatred.

The pain of abandoning their home must be tearing them apart.

But why take up arms against their own kind?

 Of course there’s a myriad of reasons, sensible or otherwise, that drive people to turn against each other. There was a rebel furious at the fact that their king was supposedly abandoning them – and yet, there’s more.

This machine has quite the range. Thankfully this stage, at least, doesn’t have any blockades.

There we go. All that Lightning won’t be quite as dangerous.

33-4 “…I wanted to prove them wrong.”

You know, little things like these can say a lot about a person. Evidently the king was a softer, gentler man before his homeworld was destroyed.

Some of the Oxsecian enemies are somewhat susceptible to Shadowbind (and other status ailments), so there’s that.

These guys drop Green Rings – 33-9 in particular is a good spot for farming them.

33-5 “Absolutely nothing. If he learns of this, it means our heads.”

A new face: these guys will spawn those vortexes (re: hazard) laterally, then vertically.

33-6 “Demolish it.”

A wall of barricades rises high overhead, cobbled together into a makeshift stronghold.

The king is curt:

"Demolish it."

More barriers – a sign we’re getting closer, it seems. The Shock Lasers in this stage are all the row-hitting ones.

33-7 Step by step, you press onward with the king, into the heart of the rebel stronghold.

              Countless traps. Ambushes. Delay tactics. Pincer attacks.

              “They sure fight dirty, don’t they…”

              While these guerrilla tactics slow you down, they fail to halt your advance. Step by step, you press onward with the king, into the heart of the rebel stronghold.

We’re met with a new foe, with an interesting adjacent skill. Observe:

They’ve become physical walls! Not a bad idea to focus on taking them out first if you can, but besides their skill they’re more a nuisance than anything else – and, luckily, they don’t also buff Magic Defense.

33-8 His flashing blade spares no one, striking without hesitation or mercy.

We’ll get a glimpse at his strength pretty soon.

Pictured: Defender helping a Generator. A bit annoying if you don’t have a lot of Darkness/Graviton mages, I guess.

Cute, they’re protecting the generator. I think the Shock Lasers are more of a threat, in all honesty…

Well, unless you’ve stacked enough capsules to just straight up go “nah” to Lightning attacks.

33-9 The memory of cradling a tiny bundle of warmth in his arms surfaces.

“Frail and fragile as a dream” is a really good metaphor for describing babies. Is it any surprise the king is so hellbent on getting her back?

Four battles with a boss at the end. The barricades are present for the first three. I got curious and tried to see if a Disarmer would get rid of them – no such luck.

Two pincers with everyone in the chain is a good way to make sure every enemy dies. As an aside, it’s weird to look at screencaps like this and know I’m using only a “mere” CT+2 mover when past chapter 34 I’ve got Bonna^ holding an Eternal Hourglass.

And here comes the boss.

True to its name, it’s got hefty defenses and health. But what is a bulwark?

According to the OED:

1a. A substantial defensive work of earth of earth, or other material; a rampart, a fortification.

2a. (Transferred and figurative) A powerful defense or safeguard. Sometimes applied to persons.

Oh, I see.

It’ll cycle through its skills in roughly this order: Lightning, 2 outer columns + Missiles, 2 outer columns + move > Lightning, 2 outer rows + Missiles, 2 outer rows > Electric, 4x6 Grid + summon an Oxsecian Medicbot > repeat the outer column/rows attacks > Missiles, 4x6 grid + summon a Medicbot > repeat

As always, I kill off the mobs first. By this point I’d stacked enough Electric-resistance to be able to tank any Electric attacks the boss uses.

At roughly 66% and 33% HP, it will summon reinforcements, not including the Medicbot that it already summons as part of its pattern.

The medicbot spawning is pretty notable since it has a roughly 10-12% chance of dropping Green Rings; you could position your team out of range of the bulwark’s attacks, let it cycle through and spawn a Medicbot, and kill the mook for Green Ring drops. Repeat until you get tired. Ideally of course this is on the 2x drop day and you have some Treasure Hunters with you.

33-10 The king curses his carelessness, but it’s too late.

Oh shit. They just fried Proto!

When the party faced off against King 54B2, I warned to make sure you’re not in his lateral range. The reason for this was because his Royal Blade, 1 row skill hurts like hell.

He’ll move of his own volition and quite literally cut down the rebels, leaving the floor with a “Stand aside!” We’re left to finish off the few rebels remaining.

On the second floor, he’ll do the same thing to the rebels here and give us a simple command: “Cut them down!” I’m pretty sure someone’s made a joke about how Sword units are great for this chapter.

On the third and final floor, you don’t even get to fight the enemies. He’ll use Royal Blade again, say “Harm her and I’ll have your heads!”. And as he leaves, he asks, “You still dare defy your king?”

This might as well be a glorified cutscene… but I like it. It does a good job at showing the king’s rage and strength: he’s enraged after seeing Proto – his trusted friend – throw himself in harm’s way to protect him, his daughter is quite likely in danger, and he is easily cleaving through the rebels with one attack.

The king cuts down the leaders of the uprising and roars a defiant challenge to the rest. The rebels surrender one by one.

36AIS is safely recovered as well. All seems to end in a decisive victory for the king.

However...

It is in that moment of triumph that the rebels achieve their objective.

"What... what is this?"

              The king is bewildered.

              "Do not make me repeat myself!"

                A retainer steps forward. His hands tremble for a moment but his gaze remains steady.

              "Forgive me, sire, but you are naive. Too naive. So we took it upon ourselves to establish these classifications."

                A note beside 36AIS's name reads: "Fit for enlistment."

              The names of several other members of the royal family are branded likewise.

              "Injustice! It was rigged from the start!"

              The people erupt into a storm of outrage.

 The truth is this:

              The Oxsecian people were divided into two groups: one that would depart their homeworld and one that would stay behind. This classification was based on their biological data with no regard for their wishes.

              Those deemed biologically inferior were relegated to the latter group and declared "fit for enlistment." It was a convenient euphemism.

              Members of the royal family aside, the "enlisted" had been left behind. Deserted.

                Understanding dawns on the king at last.

              "I told you to leave the choice to them, did I not!?"

              "Which is why I said you are naive, sire. Someone had to do the dirty work or none of us would have made it off the ground."

                The ship rumbles with angry voices, dark resentment sweeping through like a tidal wave.

              And then, a violent and blinding explosion blooms in the distance.

                "It's... gone. Our planet is gone!"

What a tragic end to the chapter. In the next chapter, we’ll conclude part 1.5.

[arxt1]

Minimal theory of massive gravity and constraints on the graviton mass. (arXiv:2110.01237v1 [astro-ph.CO])

The Minimal theory of Massive Gravity (MTMG) is endowed non-linearly with only two tensor modes in the gravity sector which acquire a non-zero mass. On a homogeneous and isotropic background the theory is known to possess two branches: the self-accelerating branch with a phenomenology in cosmology which, except for the mass of the tensor modes, exactly matches the one of $\Lambda$CDM; and the normal branch which instead shows deviation from General Relativity in terms of both background and linear perturbations dynamics. For the latter branch we study using several early and late times data sets the constraints on today's value of the graviton mass $\mu_{0}$, finding that $(\mu_{0}/H_{0})^{2}=0.119_{-0.098}^{+0.12}$ at $68\%$ CL, which in turn gives an upper bound at $95\%$ CL as $\mu_{0}<8.4\times10^{-34}$ eV. This corresponds to the strongest bound on the mass of the graviton for the normal branch of MTMG.

from gr-qc updates on arXiv.org https://ift.tt/2WF31Nx

[arxt1]

Gravity waves in parity-violating Copernican Universes. (arXiv:2001.06373v2 [gr-qc] UPDATED)

In recent work minimal theories allowing the variation of the cosmological constant, $\Lambda$, by means of a balancing torsion have been proposed. It was found that such theories contain parity violating homogeneous and isotropic solutions, due to a torsion structure called the Cartan spiral staircase. Their dynamics are controlled by Euler and Pontryagin quasi-topological terms in the action. Here we show that such theories predict a dramatically different picture for gravitational wave fluctuations in the parity violating branch. If the dynamics are ruled solely by the Euler-type term, then linear tensor mode perturbations are entirely undetermined, hinting at a new type of gauge invariance. The Pontryagin term not only permits for phenomenologically sounder background solutions (as found in previous literature), but for realistic propagation of gravitational wave modes. These have the general property that the right and left handed gravitational waves propagate with different speeds. More generally they imply modified dispersion relations for the graviton, with both parity violating and non-violating deformations, including an effective mass for both gravitational wave polarizations. We discuss the observational constraints and predictions of these theories.

from gr-qc updates on arXiv.org https://ift.tt/2RvxzLi

[arxt1]

$\mathbf{O}(D,D)$ completion of the Friedmann equations. (arXiv:1905.03620v2 [hep-th] UPDATED)

In string theory the closed-string massless NS-NS sector forms a multiplet of $\mathbf{O}(D,D)$ symmetry. This suggests a specific modification to General Relativity in which the entire NS-NS sector is promoted to stringy graviton fields. Imposing off-shell $\mathbf{O}(D,D)$ symmetry fixes the correct couplings to other matter fields and the Einstein field equations are enriched to comprise $D^{2}+1$ components, dubbed recently as the Einstein Double Field Equations. Here we explore the cosmological implications of this framework. We derive the most general homogeneous and isotropic ansatzes for both stringy graviton fields and the $\mathbf{O}(D,D)$-covariant energy-momentum tensor. Crucially, the former admits space-filling magnetic $H$-flux. Substituting them into the Einstein Double Field Equations, we obtain the $\mathbf{O}(D,D)$ completion of the Friedmann equations along with a generalized continuity equation. We discuss how solutions in this framework may be characterized by two equation-of-state parameters, $w$ and $\lambda$, where the latter characterizes the relative intensities of scalar and tensor forces. When $\lambda+3w=1$, the dilaton remains constant throughout the cosmological evolution, and one recovers the standard Friedmann equations for generic matter content (i.e. for any $w$). We further point out that, in contrast to General Relativity, neither an $\mathbf{O}(D,D)$-symmetric cosmological constant nor a scalar field with positive energy density gives rise to a de Sitter solution.

from gr-qc updates on arXiv.org https://ift.tt/2YcbRQz

[arxt1]

The Hamiltonian Dynamics of Horava Gravity. (arXiv:2001.02556v4 [hep-th] UPDATED)

We consider the Hamiltonian formulation of Horava gravity in arbitrary dimensions, which has been proposed as a renormalizable gravity model for quantum gravity without the ghost problem. We study the "full" constraint analysis of the "non-projectable" Horava gravity whose potential, V(R), is an arbitrary function of the (intrinsic) Ricci scalar R. We find that there exist generally distinct cases of this theory, depending on (i) whether the Hamiltonian constraint generates new (second-class) constraints (Cases A, C) or just fixes the associated Lagrange multipliers (Case B), or (ii) whether the IR Lorentz-deformation parameter \lambda is at the conformal point (Case C) or not (Cases A, B). It is found that, for Cases A and C, the dynamical degrees of freedom are the same as in general relativity, while, for Case B, there is "one additional phase-space degree of freedom", representing an extra (odd) scalar graviton mode. This would resolve the long-standing debates about the extra graviton modes and achieves the dynamical consistency of the Horava gravity, at the "fully non-linear" level. Several exact solutions are also considered as some explicit examples of the new constraints. The structure of the newly obtained, "extended" constraint algebra seems to be generic to Horava gravity and its general proof would be a challenging problem. Some other challenging problems, which include the path integral quantization and the Dirac bracket quantization are discussed also.

from gr-qc updates on arXiv.org https://ift.tt/36Bn1AB

[arxt1]

The Geometrical Origin of Dark Energy. (arXiv:2006.11935v1 [hep-th])

The geometrical formulation of the quantum Hamilton-Jacobi theory shows that the quantum potential is never vanishing, so that it plays the role of intrinsic energy. Such a key property selects the Wheeler-DeWitt (WDW) quantum potential $Q[g_{jk}]$ as the natural candidate for the dark energy. This leads to the WDW Hamilton-Jacobi equation with a vanishing kinetic term, and with the identification $$ \Lambda=-\frac{\kappa^2}{\sqrt{\bar g}}Q[g_{jk}] \ . $$ This shows that the cosmological constant is a quantum correction of the Einstein tensor, reminiscent of the von Weizs\"acker correction to the kinetic term of the Thomas-Fermi theory. The quantum potential also defines the Madelung pressure tensor. Such a geometrical origin of the vacuum energy density, a strictly non-perturbative phenomenon, provides strong evidence that it is due to a graviton condensate. Time independence of the WDW wave-functional then would imply that the ratio between the Planck length and the Hubble radius is a time constant, providing an infrared/ultraviolet duality. This indicates that the structure of the Universe is crucial for a formulation of Quantum Gravity.

from gr-qc updates on arXiv.org https://ift.tt/2B2Odxn

[arxt1]

The Hamiltonian Dynamics of Horava Gravity. (arXiv:2001.02556v3 [hep-th] UPDATED)

We consider the Hamiltonian formulation of Horava gravity in arbitrary dimensions, which has been proposed as a renormalizable gravity model for quantum gravity without the ghost problem. We study the "full" constraint analysis of the "non-projectable" Horava gravity whose potential, V(R), is an arbitrary function of the (intrinsic) Ricci scalar R. We find that there exist generally distinct cases of this theory, depending on (i) whether the Hamiltonian constraint generates new (second-class) constraints (Cases A, C) or just fixes the associated Lagrange multipliers (Case B), or (ii) whether the IR Lorentz-deformation parameter \lambda is at the conformal point (Case C) or not (Cases A, B). It is found that, for Cases A and C, the dynamical degrees of freedom are the same as in general relativity, while, for Case B, there is "one additional phase-space degree of freedom", representing an extra (odd) scalar graviton mode. This would resolve the long-standing debates about the extra graviton modes and achieves the dynamical consistency of the Horava gravity, at the "fully non-linear" level. Several exact solutions are also considered as some explicit examples of the new constraints. The structure of the newly obtained, "extended" constraint algebra seems to be generic to Horava gravity and its general proof would be a challenging problem. Some other challenging problems, which include the path integral quantization and the Dirac bracket quantization are discussed also.

from gr-qc updates on arXiv.org https://ift.tt/36Bn1AB

[arxt1]

Spin-dependence of Gravity-mediated Dark Matter in Warped Extra-Dimensions. (arXiv:2006.02239v1 [hep-ph])

We study the spin-dependence of Dark Matter (DM) particles which interact gravitationally with the Standard Model (SM) in an extra-dimensional Randall-Sundrum scenario. We assume that both the Dark Matter and the Standard Model are confined to the TeV (Infra-red) brane and only interact via gravitational mediators, namely Kaluza-Klein gravitons and the radion. We analyze the different DM annihilation channels and find that it is possible to achieve the presently observed relic abundance of Dark Matter, $\Omega_{\rm DM}$, within the freeze-out mechanism for DM particles of spin 0, 1/2 and 1. We study the region of the model parameter space for which $\Omega_{\rm DM}$ is achieved and compare it with the different experimental and theoretical bounds. We also consider the impact of the radion in the phenomenology. We find that, for DM particles mass $m_{\rm DM} \in [1,15]$ TeV, most of the parameter space is excluded by the current constraints or will be excluded by the LHC Run III or by the LHC upgrade, the HL-LHC. The presence of the radion does not modify significantly the non-excluded region. The observed DM relic abundance can still be achieved for DM masses $m_{\rm } \in [4,15]$ TeV and $m_{G_1} < 10$ TeV for scalar and vector boson Dark Matter. On the other hand, for spin 1/2 fermion Dark Matter, only a tiny region with $m_{\rm DM } \in [4, 15]$ TeV, $m_{G_1} \in [5,10]$ TeV and $\Lambda > m_{G_1}$ is compatible with theoretical and experimental bounds.

from astro-ph.HE updates on arXiv.org https://ift.tt/2U3UUFO

[arxt1]

Modified general relativity and quantum theory in curved spacetime. (arXiv:1909.03845v2 [gr-qc] UPDATED)

With minor but important modifications, the multi-spin Klein-Gordon equation of flat spacetime can be adapted to curved spacetime for spins 0,1 and 1/2. From the existence in a Lorentzian spacetime of a line element field $(X^{\beta},-X^{\beta}) $, the spin-1 Klein-Gordon (KG) equation $\nabla_{\mu}\nabla^{\mu}X^{\beta}=k^{2}X^{\beta} $ is derived from an action functional involving $X^{\beta} $ and its covariant derivative $ \varPsi_{\alpha\beta}=\nabla_{\alpha}X_{\beta} $. The spin-0 KG equation is then constructed from the scalar $ \phi=\varPsi_{\alpha\beta}g^{\alpha\beta} $. The KG equation of the outer product of the spin-1/2 Dirac spinor and its Hermitian conjugate, yields twice the spin-1 KG equation. Thus, $ X^{\beta} $ plays the role of a fundamental quantum vector field. The left side of the asymmetric KG wave equation is then symmetrized. The symmetric part, $ \tilde{\varPsi}_{\alpha\beta}$, is the Lie derivative of the metric. This links the Klein-Gordon equation to Modified general relativity, $ \frac{8\pi G}{c^{4}}\tilde{T}_{\alpha\beta}=G_{\alpha\beta}+\varPhi_{\alpha\beta} $, for spins 1,0 and 1/2 because $\varPhi_{\alpha\beta}=\frac{1}{2}\tilde{\varPsi}_{\alpha\beta}+u^{\lambda}(u_{\alpha}\nabla_{\beta}X_{\lambda}+u_{\beta}\nabla_{\alpha}X_{\lambda}) $. The Einstein equation of Modified general relativity is intrinsically hidden in the spin-2 KG equation. Massless gravitons do not exist as force mediators of gravity in a four-dimensional time-oriented Lorentzian spacetime. The diffeomorphism group Diff(M) is not restricted to the Lorentz group. $ \tilde{\varPsi}_{\alpha\beta}$ can instantaneously transmit information to, and quantum properties from, its antisymmetric partner $ K_{\alpha\beta} $ along $ X^{\beta} $. This establishes the concept of entanglement within a Lorentzian formalism.

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