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Accelerating universes driven by bulk particles

F. A. Brito1, F. F. Cruz2, and J. F. N. Oliveira2

  • 1Departamento de Física, Universidade Federal de Campina Grande, 58109-970 Campina Grande, Paraíba, Brazil
  • 2Departamento de Matemática, Universidade Regional do Cariri, 63040-000 Juazeiro do Norte, Ceará, Brazil

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Phys. Rev. D 71, 083516 – Published 22 April, 2005

DOI: https://doi.org/10.1103/PhysRevD.71.083516

Abstract

We consider our universe as a 3d domain wall embedded in a 5d dimensional Minkowski space-time. We address the problem of inflation and late time acceleration driven by bulk particles colliding with the 3d domain wall. The expansion of our universe is mainly related to these bulk particles. Since our universe tends to be permeated by a large number of isolated structures, as temperature diminishes with the expansion, we model our universe with a 3d domain wall with increasing internal structures. These structures could be unstable 2d domain walls evolving to fermi-balls which are candidates to cold dark matter. The momentum transfer of bulk particles colliding with the 3d domain wall is related to the reflection coefficient. We show a nontrivial dependence of the reflection coefficient with the number of internal dark matter structures inside the 3d domain wall. As the population of such structures increases the velocity of the domain wall expansion also increases. The expansion is exponential at early times and polynomial at late times. We connect this picture with string/M-theory by considering BPS 3d domain walls with structures which can appear through the bosonic sector of a five-dimensional supergravity theory.

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Phys. Rev. D 71, 083516– Published 22 April, 2005
  • Received 2 March 2005

© 2005 American Physical Society

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