Dynamic vacuum variable and equilibrium approach in cosmology

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Abstract

A modified-gravity theory is considered with a four-form field strength F, a variable gravitational coupling parameter G(F), and a standard matter action. This theory provides a concrete realization of the general vacuum variable q as the four-form amplitude F and allows for a study of its dynamics. The theory gives a flat Friedmann-Robertson-Walker 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 vacuum energy 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 in the standard Friedmann-Robertson-Walker framework.

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Original languageEnglish
Article number063528
Pages (from-to)1-12
JournalPhysical Review D
Volume78
Issue number6
Publication statusPublished - 2008
MoE publication typeA1 Journal article-refereed

    Research areas

  • dynamic vacuum, modofied gravity theory

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