The effect of inhomogeneous expansion on the supernova observations

Details The effect of inhomogeneous expansion on the supernova observations The effect of inhomogeneous expansion on the supernova observations

2006-09-05

arxiv.org/abs/astro-ph/0609120v4

JCAP 0702:019,2007

Astronomy and Astrophysics

Astrophysics

minor corrections to match the version published in JCAP

Scientific paper

10.1088/1475-7516/2007/02/019

We consider an inhomogeneous but spherically symmetric Lemaitre-Tolman-Bondi model to demonstrate that spatial variations of the expansion rate can have a significant effect on the cosmological supernova observations. A model with no dark energy but a local Hubble parameter about 15% larger than its global value fits the supernova data better than the homogeneous model with the cosmological constant. The goodness of the fit is not sensitive to inhomogeneities in the present-day matter density, and our best fit model has Omega_M ~ 0.3, in agreement with galaxy surveys. We also compute the averaged expansion rate, defined by the Buchert equations, of the best fit model and show explicitly that there is no average acceleration.

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