Predictive power of strong coupling in theories with large distance modified gravity

Gia Dvali

    Research output: Contribution to journalArticle

    Abstract

    We consider theories that modify gravity at cosmological distances, and show that any such theory must exhibit a strong coupling phenomenon, or else it is either inconsistent or is already ruled out by solar system observations. We show that all the ghost-free theories that modify dynamics of spin-2 graviton on asymptotically flat backgrounds, automatically have this property. Due to the strong coupling effect, modification of the gravitational force is source-dependent, and for lighter sources sets in at shorter distances. This universal feature makes modified gravity theories predictive and potentially testable not only by cosmological observations, but also by precision gravitational measurements at scales much shorter than the current cosmological horizon.

    Original languageEnglish (US)
    Article number326
    JournalNew Journal of Physics
    Volume8
    DOIs
    StatePublished - Dec 19 2006

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

    Fingerprint Dive into the research topics of 'Predictive power of strong coupling in theories with large distance modified gravity'. Together they form a unique fingerprint.

  • Cite this