Inhomogeneous dusty Universes and their deceleration
arXiv:hep-th/0505222 · doi:10.1016/j.physletb.2006.01.019
Abstract
Exact results stemming directly from Einstein equations imply that inhomogeneous Universes endowed with vanishing pressure density can only decelerate, unless the energy density of the Universe becomes negative. Recent proposals seem to argue that inhomogeneous (but isotropic) space-times, filled only with incoherent matter,may turn into accelerated Universes for sufficiently late times. To scrutinize these scenarios, fully inhomogeneous Einstein equations are discussed in the synchronous system. In a dust-dominated Universe, the inhomogeneous generalization of the deceleration parameter is always positive semi-definite implying that no acceleration takes place.
8 pages; minor corrected typos
References in corpus (6)
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- The Cosmological Constant Problem, an Inspiration for New Physics
- Evidence for the Fifth Element Astrophysical status of Dark Energy
- Spherically symmetric inhomogeneous model with Chaplygin gas
- Averaging anisotropic cosmologies
- Inhomogeneities in dusty universe - a possible alternative to dark energy?
- Why CMB physics?
- Gradient expansion, curvature perturbations and magnetized plasmas
- Long-Wavelength Modes of Cosmological Scalar Fields
- Cosmic Acceleration Driven by Mirage Inhomogeneities