Strong interactions and stability in the DGP model

Markus A. Luty, Massimo Porrati, Riccardo Rattazzi

    Research output: Contribution to journalArticlepeer-review


    The model of Dvali, Gabadadze, and Porrati (DGP) gives a simple geometrical setup in which gravity becomes 5-dimensional at distances larger than a length scale λDGP. We show that this theory has strong interactions at a length scale λ3 ∼ (λDGP2/Mp) 1/3. If λDGP is of order the Hubble length, then the theory loses predictivity at distances shorter than λ3 ∼ 1000 km. The strong interaction can be viewed as arising from a longitudinal 'eaten Goldstone' mode that gets a small kinetic term only from mixing with transverse graviton polarizations, analogous to the case of massive gravity. We also present a negative-energy classical solution, which can be avoided by cutting off the theory at the same scale scale λ3. Finally, we examine the dynamics of the longitudinal Goldstone mode when the background geometry is curved.

    Original languageEnglish (US)
    Pages (from-to)649-671
    Number of pages23
    JournalJournal of High Energy Physics
    Issue number9
    StatePublished - Sep 1 2003


    • Brane Dynamics in Gauge Theories
    • Extra Large Dimensions
    • Field Theories in Higher Dimensions

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics


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