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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
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
![June “Wakalix”, [null]](https://pbs.twimg.com/profile_images/1187814014992076800/5SLXiLlV_normal.jpg)
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
I’m actually rather proud of this mini explanation of gauge gravity
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