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Darkness without dark matter and energy -- generalized unimodular gravity | | A.O. Barvinsky
; A.Yu. Kamenshchik
; | | Date: |
26 May 2017 | | Abstract: | We suggest a Lorentz non-invariant generalization of the unimodular gravity
theory, which is classically equivalent to general relativity with a locally
inert (devoid of local degrees of freedom) perfect fluid having an equation of
state with a constant parameter $w$. For the range of $w$ near $-1$ this dark
fluid can play the role of dark energy, while for $w=0$ this dark dust admits
spatial inhomogeneities and can be interpreted as dark matter. We discuss
possible implications of this model in the cosmological initial conditions
problem. In particular, this is the extension of known microcanonical density
matrix predictions for the initial quantum state of the closed cosmology to the
case of spatially open Universe, based on the imitation of the spatial
curvature by the dark fluid density. We also briefly discuss quantization of
this model necessarily involving the method of gauge systems with reducible
constraints and the effect of this method on the treatment of recently
suggested mechanism of vacuum energy sequestering. | | Source: | arXiv, 1705.9470 | | Services: | Forum | Review | PDF | Favorites | |
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