Weakly coupled metastable graviton

Gregory Gabadadze

    Research output: Contribution to journalArticle

    Abstract

    A graviton of a nonzero mass and decay width propagates five physical polarizations. The question of interactions of these polarizations is crucial for viability of models of massive/metastable gravity. This question is addressed in the context of the DGP model of a metastable graviton. First, we argue that the well-known breakdown of a naive perturbative expansion at a low scale is an artifact of the weak-field expansion itself. Then, we propose a different expansion-the constrained perturbation theory-in which the breakdown does not occur and the theory is perturbatively tractable all the way up to its natural ultraviolet cutoff. In this approach the couplings of the extra polarizations to matter and their self-couplings appear to be suppressed and should be neglected in measurements at subhorizon scales. The model reproduces results of General Relativity at observable distances with high accuracy, while predicting deviations from them at the present day horizon scale.

    Original languageEnglish (US)
    Article number064005
    JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
    Volume70
    Issue number6
    DOIs
    StatePublished - 2004

    Fingerprint

    gravitons
    Polarization
    expansion
    Breakdown
    polarization
    breakdown
    General Relativity
    Viability
    viability
    Ultraviolet
    Perturbation Theory
    horizon
    artifacts
    relativity
    Horizon
    Gravity
    High Accuracy
    cut-off
    Deviation
    perturbation theory

    ASJC Scopus subject areas

    • Physics and Astronomy(all)
    • Nuclear and High Energy Physics
    • Mathematical Physics

    Cite this

    Weakly coupled metastable graviton. / Gabadadze, Gregory.

    In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 70, No. 6, 064005, 2004.

    Research output: Contribution to journalArticle

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