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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
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
What is M_P here? Planck mass?
Not sure I follow here how you end up with a repulsive potential though. exp(-mr)/r is still attractive at all distances.
yea that's a more subtle argument i didn't work through
I remember a talk once of somebody claiming something along the lines that massive gravity necessarily leads to closed causal cirves. (How) does that connect with the present discussion?
the graviton mass is severely constrained by the multimessenger neutron merger, are the values for explaining dark energy still allowed?
So what's your opinion about her findings?
Thanks for this thread. Very helpful!
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