Lemaitre-Tolman-Bondi model and accelerating expansion

Thumbnail Image

Date

Authors

Journal Title

Journal ISSN

Volume Title

Publisher

Abstract

Description

I discuss the spherically symmetric but inhomogeneous Lemaitre-Tolman- Bondi (LTB) metric, which provides an exact toy model for an inhomogeneous universe. Since we observe light rays from the past light cone, not the expansion of the universe, spatial variation in matter density and Hubble rate can have the same effect on redshift as acceleration in a perfectly homogeneous universe. As a consequence, a simple spatial variation in the Hubble rate can account for the distant supernova data in a dust universe without any dark energy. I also review various attempts towards a semirealistic description of the universe based on the LTB model.
Invited Review for a special Gen. Rel. Grav. issue on Dark Energy. 17 pages, 3 figures

Keywords

Astrophysics

Citation

URI

http://salesiana.dossiersoluciones.com/handle/123456789/193636

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0709.2044
 http://arxiv.org/abs/0709.2044
 Gen.Rel.Grav.40:451-466,2008
 doi:10.1007/s10714-007-0553-9

Collections

arXiv