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InertialObservr's profile
〈 Berger | Dillon 〉
〈 Berger | Dillon 〉
〈 Berger | Dillon 〉
@InertialObservr

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〈 Berger | Dillon 〉

@InertialObservr

PhD student of Theoretical Particle Physics @UCIrvine l @NSF Fellow l Physics & Math Animations l Patreon: https://www.patreon.com/inertialobserver …

DC → CA
youtube.com/c/InertialObse…
Joined August 2015

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    1. 〈 Berger | Dillon 〉‏ @InertialObservr Jan 26
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      Prof. Claudia de Rahm's theory of 'Massive Gravity' to explain Dark Energy is getting a lot of press as of late. So let's dig into it. (thread: 1/n)https://www.theguardian.com/science/2020/jan/25/has-physicists-gravity-theory-solved-impossible-dark-energy-riddle …

      10 replies 167 retweets 727 likes
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    2. 〈 Berger | Dillon 〉‏ @InertialObservr Jan 26
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      Before getting to gravity, recall that forces are transmitted by a 'mediator' which are always bosons EM: the photon, strong force: gluon, weak force: W± & Z. When the symmetry corresponding to the force carrier is unbroken the force carriers are massless (m=0). (2/n)pic.twitter.com/7Y38aPPQOa

      5 replies 11 retweets 105 likes
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    3. 〈 Berger | Dillon 〉‏ @InertialObservr Jan 26
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      What about Gravity? The symmetry corresponding to gravity is the most respected symmetry in all physics & goes by many names It's the one underlying Einstein's General Theory of Relativity: General Covariance/Gauge-Lorentz Symmetry/ Diffeomorphism Invariance (3/n)pic.twitter.com/Y5DyRN2qMg

      6 replies 11 retweets 64 likes
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    4. 〈 Berger | Dillon 〉‏ @InertialObservr Jan 26
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      Because this symmetry (General Covariance) has never been observed to be violated, physicists were convinced that the gauge field corresponding to gravity corresponded to an exact, unbroken symmetry I would then immediately follow, then, that the graviton is massless

      2 replies 8 retweets 40 likes
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    5. 〈 Berger | Dillon 〉‏ @InertialObservr Jan 26
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      But wait!, says de Rahm.. Perhaps Lorentz symmetry could just be an *approximate* symmetry of nature This would happen if the graviton (hμν) has a mass--mass terms for gauge fields always break gauge invariance But!.. look at the first tweet.. (5/n)pic.twitter.com/cgEyMtE73l

      1 reply 7 retweets 49 likes
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    6. 〈 Berger | Dillon 〉‏ @InertialObservr Jan 26
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      Boom! We see that the graviton (metric; hμν) contains the exponential potential we expected! TL;DR: If the graviton has a mass~hubble rate (H), then large scale gravity can act repulsive and reproduce the Dark Energy observations, with no Dark Energy at all! (n/n)pic.twitter.com/bN8NKU4jAp

      12 replies 13 retweets 122 likes
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    7. 〈 Berger | Dillon 〉‏ @InertialObservr Jan 26
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      I’m actually rather proud of this mini explanation of gauge gravity

      10 replies 2 retweets 101 likes
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    8. Asad Hussain‏ @PotatoAsad Jan 26
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      Replying to @InertialObservr

      Amazing thread! Is this the breaking of GL(4,R) -> SO(1,3)? Or is this like complete symmetry breaking, with no massless bosons remaining?

      1 reply 0 retweets 0 likes
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      〈 Berger | Dillon 〉‏ @InertialObservr Jan 26
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      Replying to @LambdaQG @PotatoAsad

      It’s what’s called “explicit symmetry breaking” or “weak symmetry breaking”

      6:21 PM - 26 Jan 2020
      3 replies 0 retweets 0 likes
        1. New conversation
        1. 〈 Berger | Dillon 〉‏ @InertialObservr Jan 26
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          Replying to @InertialObservr @LambdaQG @PotatoAsad

          Sorry I meant to say “soft” SB not ‘weak’

          1 reply 0 retweets 1 like
        2. Asad Hussain‏ @PotatoAsad Jan 26
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          Replying to @InertialObservr @LambdaQG

          So THAT'S what soft SB is. Heard the term, never got what it meant. Now I have an example. Thanks!

          1 reply 0 retweets 2 likes
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        1. Asad Hussain‏ @PotatoAsad Jan 26
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          Replying to @InertialObservr @LambdaQG

          OHHH ok so this is different to spontaneous symmetry breaking. Thanks!

          0 replies 0 retweets 1 like
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