Supernova constraints on spatial variations of the vacuum energy density

Details Supernova constraints on spatial variations of the vacuum energy density Supernova constraints on spatial variations of the vacuum energy density

2001-03-05

arxiv.org/abs/astro-ph/0103075v2

Phys.Rev. D64 (2001) 063505

Astronomy and Astrophysics

Astrophysics

cosmetic changes; version to appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.64.063505

We consider a very simple toy model for a spatially varying `cosmological constant', where we are inside a spherical bubble (with a given set of cosmological parameters) that is surrounded by a larger region where these parameters are different. This model includes essential features of more realistic scenarios with a minimum number of parameters. We calculate the luminosity distance in the presence of spatial variations of the vacuum energy density using linear perturbation theory and discuss the use of type Ia supernovae to impose constraints on this type of models. We find that presently available observations are only constraining at very low redshifts, but also provide independent confirmation that the high red-shift supernovae data does prefer a relatively large positive cosmological constant.

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