Late acceleration and w=1 crossing in induced gravity

Pantelis S. Apostolopoulos and Nikolaos Tetradis
Phys. Rev. D 74, 064021 – Published 19 September 2006

Abstract

We study the cosmological evolution on a brane with induced gravity within a bulk with arbitrary matter content. We consider a Friedmann-Robertson-Walker brane, invariantly characterized by a six-dimensional group of isometries. We derive the effective Friedmann and Raychaudhuri equations. We show that the Hubble expansion rate on the brane depends on the covariantly defined integrated mass in the bulk, which determines the energy density of the generalized dark radiation. The Friedmann equation has two branches, distinguished by the two possible values of the parameter ϵ=±1. The branch with ϵ=1 is characterized by an effective cosmological constant and accelerated expansion for low energy densities. Another remarkable feature is that the contribution from the generalized dark radiation appears with a negative sign. As a result, the presence of the bulk corresponds to an effective negative energy density on the brane, without violation of the weak energy condition. The transition from a period of domination of the matter energy density by nonrelativistic brane matter to domination by the generalized dark radiation corresponds to a crossing of the phantom divide w=1.

  • Received 18 April 2006

DOI:https://doi.org/10.1103/PhysRevD.74.064021

©2006 American Physical Society

Authors & Affiliations

Pantelis S. Apostolopoulos1,* and Nikolaos Tetradis2,†

  • 1Departament de Física, Universitat de les Illes Balears, Cra. Valldemossa Km 7.5, E-07122 Palma de Mallorca, Spain
  • 2University of Athens, Department of Physics, University Campus, Zographou 157 84, Athens, Greece

  • *Electronic address: vdfspap8@uib.es; papost@phys.uoa.gr
  • Electronic address: ntetrad@phys.uoa.gr

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Issue

Vol. 74, Iss. 6 — 15 September 2006

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