Strong interactions and stability in the DGP model

Abstract

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 ∼ (λDGP/MP). If λDGP is of order the Hubble length, then the theory loses predictivity at distances shorter than λ3 ∼ 1000… (More)

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