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29 March 2024
 
  » arxiv » 0806.2805

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Dynamic vacuum variable and equilibrium approach in cosmology
F.R. Klinkhamer ; G.E. Volovik ;
Date 17 Jun 2008
AbstractA 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
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