Gravitational backreaction of matter inhomogeneities

A. Gruzinov, M. Kleban, M. Porrati, M. Redi

    Research output: Contribution to journalArticlepeer-review


    The non-linearity of Einstein's equations makes it possible for small scale matter inhomogeneities to affect the universe at cosmological distances. We study the size of such effects using a simple heuristic model that captures the most important backreaction effect due to non-relativistic matter, as well as several exact solutions describing inhomogeneous and anisotropic expanding universes. We find that the effects are O(H2l2/c 2) or smaller, where H is the Hubble parameter and l the typical size scale of inhomogeneities. For virialized structures this is of order v 2/c2, where v is the characteristic peculiar velocity.

    Original languageEnglish (US)
    Article number001
    JournalJournal of Cosmology and Astroparticle Physics
    Issue number12
    StatePublished - Dec 1 2006


    • Cosmological perturbation theory
    • Gravity

    ASJC Scopus subject areas

    • Astronomy and Astrophysics


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