Dynamic vacuum variable and equilibrium approach in cosmology
arXiv:0806.2805 · doi:10.1103/PhysRevD.78.063528
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.
24 (not 25) pages, v7(=v6 with latex problem corrected): published version in preprint style
References in corpus (8)
- Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
- Dark Energy and the Accelerating Universe
- New Hubble Space Telescope Discoveries of Type Ia Supernovae at z > 1: Narrowing Constraints on the Early Behavior of Dark Energy
- Disappearing cosmological constant in f(R) gravity
- Self-tuning vacuum variable and cosmological constant
- The Cosmological Constant is Probably Zero, and a Proof is Possibly Right
- Vacuum Energy: Myths and Reality
- Equilibrium boundary conditions, dynamic vacuum energy, and the Big Bang
Cited by in corpus (13)
- Hubble expansion and structure formation in the "running FLRW model" of the cosmic evolution
- Gluonic vacuum, q-theory, and the cosmological constant
- Cosmological constant from quarks and torsion
- z=3 Lifshitz-Horava model and Fermi-point scenario of emergent gravity
- On vacuum-energy decay from particle production
- Emergent gravity: the BEC paradigm
- Model for a time-symmetric Milne-like universe without big bang curvature singularity
- Equilibrium boundary conditions, dynamic vacuum energy, and the Big Bang
- Effective cosmological constant from TeV-scale physics: Simple field-theoretic model
- Classical stability of higher-derivative q-theory in the four-form-field-strength realization
- Instability of the big bang coordinate singularity in a Milne-like universe
- UHECR bounds on Lorentz violation in the photon sector
- Lorentz invariance, vacuum energy, and cosmology