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General Relativity and Gravitation

, Volume 40, Issue 2–3, pp 451–466 | Cite as

Lemaitre–Tolman–Bondi model and accelerating expansion

  • Kari Enqvist
Research Article

Abstract

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.

Keywords

Dark energy Supernovae Cosmology Gravitation 

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  1. 1.Department of Physical Sciences and Helsinki Institute of PhysicsUniversity of HelsinkiHelsinkiFinland

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