Dark energy from backreaction

Abstract

We consider the effect of inhomogeneities on the expansion of the Einstein-de Sitter universe. We find that the backreaction of linear scalar metric perturbations results in apparent dark energy with a mixture of equations of state between 0 and -4/3. We discuss the possibility that backreaction could account for present-day acceleration.

21 pages, LaTeX2e, JCAP-style. v2: Added references, corrected a typo, minor clarifications. v3: Version accepted for publication. Added references and clarifications

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