Supernovae data and perturbative deviation from homogeneity

Details Supernovae data and perturbative deviation from homogeneity Supernovae data and perturbative deviation from homogeneity

2009-07-23

arxiv.org/abs/0907.4003v2

JCAP09(2009)022

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

8 pages, 3 figures; v2: 1 figure added, references added/updated, minor modifications and clarifications, matches published ve

Scientific paper

10.1088/1475-7516/2009/09/022

We show that a spherically symmetric perturbation of a dust dominated $\Omega=1$ FRW universe in the Newtonian gauge can lead to an apparent acceleration of standard candles and provide a fit to the magnitude-redshift relation inferred from the supernovae data, while the perturbation in the gravitational potential remains small at all scales. We also demonstrate that the supernovae data does not necessarily imply the presence of some additional non-perturbative contribution by showing that any Lemaitre-Tolman-Bondi model fitting the supernovae data (with appropriate initial conditions) will be equivalent to a perturbed FRW spacetime along the past light cone.

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