Lemaitre–Tolman–Bondi model and accelerating expansion

By K. Enqvist. 2007

214 citations recorded by the source corpus.

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.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/19a2ab55bbdce68aa5134353a485355e9cdf98b3

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In Astronomy and Astrophysics

Citations in the corpus

General Relativity and Cosmology: Unsolved Questions and Future Directions (2016, background): “me elapsed since that redshift are tightly related via the only free function, a(t). If the universe is isotropic around us, but not homogeneous, that is, a non-Copernican Tolman-Bondi-Lemaître model [279], then this relation would be lost and present data might not imply acceleration. A Copernican ”
Confronting Lemaitre–Tolman–Bondi models with observational cosmology (2008, methodology): “The other components of Einstein equations read [18, 19]”
Backreaction in Late-Time Cosmology (2011, unknown): “In particular, we do not discuss models with Gpcscale structures where, for instance, the observer is located near the centre of a large void [14].”
Cosmology and Fundamental Physics with the Euclid Satellite (2012, background): “, if the matter density fraction is assumed homogeneous today (and only today) (Enqvist 2008).”