Non-linear interactions in a cosmological background in the DGP braneworld

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dc.creatorKoyama, Kazuya
dc.creatorSilva, Fabio P
dc.date2007-02-20
dc.date.accessioned2026-07-07T11:23:41Z
dc.date.available2026-07-07T11:23:41Z
dc.descriptionWe study quasi-static perturbations in a cosmological background in the Dvali-Gabadadze-Porrati (DGP) braneworld model. We identify the Vainshtein radius at which the non-linear 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 linearised 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.
dc.description11 pages
dc.identifierhttps://arxiv.org/abs/hep-th/0702169
dc.identifierhttp://arxiv.org/abs/hep-th/0702169
dc.identifierPhys.Rev.D75:084040,2007
dc.identifierdoi:10.1103/PhysRevD.75.084040
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/194971
dc.subjectHigh Energy Physics - Theory
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.titleNon-linear interactions in a cosmological background in the DGP braneworld
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