Born-Infeld cosmology with scalar Born-Infeld matter

May 3, 2016
12 pages
Published in:
  • Phys.Rev.D 94 (2016) 6, 064016
  • Published: Sep 8, 2016
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Abstract: (APS)
Cosmology in Eddington-inspired Born-Infeld gravity is investigated using a scalar Born-Infeld field (e.g. tachyon condensate) as matter. In this way, both in the gravity and matter sectors we have Born-Infeld-like structures characterized by their actions and via two separate constants, κ and αT2, respectively. With a particular choice of the form of ϕ˙ (the time derivative of the Born-Infeld scalar), analytical cosmological solutions are found. Thereafter, we explore some of the unique features of the corresponding cosmological spacetimes. For κ>0, our solution has a de Sitter-like expansion both at early and late times, with an intermediate deceleration sandwiched between the accelerating phases. On the other hand, when κ<0, the initial de Sitter phase is replaced by a bounce. Our solutions, at late time, fit well with available supernova data—a fact we demonstrate explicitly. The estimated properties of the Universe obtained from the fitting of the κ>0 solution are as good as in ΛCDM cosmology. However, the κ<0 solution has to be discarded due to the occurrence of a bounce at an unacceptably low redshift.
Note:
  • 24 pages, 8 figures. Published version
  • tachyon: condensation
  • redshift: low
  • Born-Infeld model
  • cosmological model
  • gravitation
  • bounce
  • time dependence
  • deceleration
  • space-time: de Sitter
  • supernova