Physical effects of consistent cosmological averaging
| Autor: | D. Leigh Herman, Alan Coley, Iain A. Brown, Joey Latta |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Physics
Nuclear and High Energy Physics Inhomogeneous cosmology Deceleration parameter 010308 nuclear & particles physics Scalar (mathematics) Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences Cosmology Metric expansion of space General Relativity and Quantum Cosmology symbols.namesake De Sitter universe Quantum mechanics 0103 physical sciences Cosmological perturbation theory symbols 010306 general physics Hubble's law |
| Zdroj: | Physical Review D. 88 |
| ISSN: | 1550-2368 1550-7998 |
| DOI: | 10.1103/physrevd.88.083523 |
| Popis: | We use cosmological perturbation theory to study the backreaction effects of a self-consistent and well-defined cosmological averaging on the dynamics and the evolution of the Universe. Working with a perturbed Friedman-Lema\^{\i}tre-Robertson-Walker Einstein--de Sitter cosmological solution in a comoving volume-preserving gauge, we compute the expressions for the expansion scalar and deceleration parameter to second order, which we use to characterize the backreaction. We find that the fractional shift in the Hubble parameter with respect to the input background cosmological model is $\overline{\ensuremath{\Delta}}\ensuremath{\approx}{10}^{\ensuremath{-}5}$, which leads to ${\ensuremath{\Omega}}_{\mathrm{eff}}$ of the order of a few times ${10}^{\ensuremath{-}5}$. In addition, we find that an appropriate measure of the fractional shift in the deceleration parameter $\overline{Q}$ is very large. |
| Databáze: | OpenAIRE |
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