Born-Infeld cosmology with scalar Born-Infeld matter
May 3, 201612 pages
Published in:
- Phys.Rev.D 94 (2016) 6, 064016
- Published: Sep 8, 2016
e-Print:
- 1605.00820 [gr-qc]
View in:
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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
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