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- W1492154955 abstract "We study quasistatic perturbations in a cosmological background in the Dvali-Gabadadze-Porrati braneworld model. We identify the Vainshtein radius at which the nonlinear interactions of the brane bending mode become important in a cosmological background. The Vainshtein radius in the early universe is much smaller than the one in the Minkowski background, but in a self-accelerating universe it is the same as the Minkowski background. Our result shows that the perturbative approach is applicable beyond the Vainshtein radius for weak gravity by taking into account the second-order effects of the brane bending mode. The linearized cosmological perturbations are shown to be smoothly matched to the solutions inside the Vainshtein radius. We emphasize the importance of imposing a regularity condition in the bulk by solving the 5D perturbations and we highlight the problem of ad hoc assumptions on the bulk gravity that lead to different conclusions." @default.
- W1492154955 created "2016-06-24" @default.
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- W1492154955 date "2007-04-27" @default.
- W1492154955 modified "2023-10-02" @default.
- W1492154955 title "Nonlinear interactions in a cosmological background in the Dvali-Gabadadze-Porrati braneworld" @default.
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- W1492154955 doi "https://doi.org/10.1103/physrevd.75.084040" @default.
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