Do Large-Scale Inhomogeneities Explain Away Dark Energy?

Details Do Large-Scale Inhomogeneities Explain Away Dark Energy? Do Large-Scale Inhomogeneities Explain Away Dark Energy?

2005-03-25

arxiv.org/abs/astro-ph/0503553v3

Phys.Rev. D72 (2005) 023517

Astronomy and Astrophysics

Astrophysics

4 Pages, no figures. Minor modifications, added references

Scientific paper

10.1103/PhysRevD.72.023517

Recently, new arguments (astro-ph/0501152, hep-th/0503117) for how corrections from super-Hubble modes can explain the present-day acceleration of the universe have appeared in the literature. However, in this letter, we argue that, to second order in spatial gradients, these corrections only amount to a renormalization of local spatial curvature, and thus cannot account for the negative deceleration. Moreover, cosmological observations already put severe bounds on such corrections, at the level of a few percent, while in the context of inflationary models, these corrections are typically limited to ~ 10^{-5}. Currently there is no general constraint on the possible correction from higher order gradient terms, but we argue that such corrections are even more constrained in the context of inflationary models.

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