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Astronomy and Cosmology
Cosmology
Internal energy of a comoving volume increasing as space expands?
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[QUOTE="Haelfix, post: 6820858, member: 4167"] Unimodular gravity is basically GR with the additional constraint that the determinant of the metric is enforced to be 1. I am not sure if there is a canonical reference of the theory perse, but it is often discussed in reviews on the cosmological constant problem. For instance Weinberg discusses it in his original review paper, and for a (skeptical) take see (eg p8 of arXiv:1502.05296). Both actually. The "old" cosmological constant problem was why the CC was exactly zero (which was ruled out in 98 after the measurements of the type IIa supernova). However right around that time inflation was becoming more and more accepted. The pre-existing but strengthening measurements from COBE as well as the supernova results convinced a lot of my colleagues.. Inflation had passed a nontrivial prediction. [/QUOTE]
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Astronomy and Cosmology
Cosmology
Internal energy of a comoving volume increasing as space expands?
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