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Article overview
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Dynamic vacuum variable and equilibrium approach in cosmology | F.R. Klinkhamer
; G.E. Volovik
; | Date: |
17 Jun 2008 | Abstract: | A relatively simple gravity theory is considered with a four-form field
strength F, a variable gravitational coupling constant G(F), and a standard
matter action. This particular theory provides a concrete realization of the
generic vacuum variable q as the four-form amplitude F and allows for a study
of its dynamics, F=F(t). The theory gives a flat Friedmann-Robertson-Walker
(FRW) universe with rapid oscillations of the effective vacuum energy density
(cosmological "constant"), whose amplitude drops to zero asymptotically.
Extrapolating to the present age of the universe, the order of magnitude of the
average vacuum energy density agrees with the observed near-critical density of
the present universe. It may even be that this type of oscillating vacuum
energy density constitutes a significant part of the so-called cold dark matter
(CDM) in the standard FRW framework. | Source: | arXiv, 0806.2805 | Services: | Forum | Review | PDF | Favorites |
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