Probing Newton's constant on vast scales: Dvali-Gabadadze-Porrati gravity, cosmic acceleration, and large scale structure

Arthur Lue, Román Scoccimarro, Glenn D. Starkman

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The nature of the fuel that drives today's cosmic acceleration is an open and tantalizing mystery. The brane-world theory of Dvali, Gabadadze, and Porrati (DGP) provides a context where late-time acceleration is driven not by some energy-momentum component (dark energy), but rather is the manifestation of the excruciatingly slow leakage of gravity off our four-dimensional world into an extra dimension. At the same time, DGP gravity alters the gravitational force law in a specific and dramatic way at cosmologically accessible scales. We derive the DGP gravitational force law in a cosmological setting for spherical perturbations at subhorizon scales and compute the growth of large-scale structures. We find that a residual repulsive force at large distances gives rise to a suppression of the growth of density and velocity perturbations. Explaining the cosmic acceleration in this framework leads to a present day fluctuation power spectrum normalization σ8≤0.8 at about the two-sigma level, in contrast with observations. We discuss further theoretical work necessary to go beyond our approximations to confirm these results.

    Original languageEnglish (US)
    Article number124015
    JournalPhysical Review D
    Volume69
    Issue number12
    DOIs
    StatePublished - 2004

    ASJC Scopus subject areas

    • Physics and Astronomy (miscellaneous)

    Fingerprint Dive into the research topics of 'Probing Newton's constant on vast scales: Dvali-Gabadadze-Porrati gravity, cosmic acceleration, and large scale structure'. Together they form a unique fingerprint.

    Cite this