Evolution of Anisotropies in Eddington-Born-Infeld Cosmology

Details Evolution of Anisotropies in Eddington-Born-Infeld Cosmology Evolution of Anisotropies in Eddington-Born-Infeld Cosmology

2008-06-23

arxiv.org/abs/0806.3613v3

Phys.Rev.D78:063013,2008

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

10 pages, 7 figures. v2: ref. added, v3: figs. improved, new paragraph in the Conclusions. Accepted in PRD

Scientific paper

10.1103/PhysRevD.78.063013

Recently a Born-Infeld action for dark energy and dark matter that uses additional affine connections was proposed. At background level, it was shown that the new proposal can mimic the standard cosmological evolution. In Bianchi cosmologies, contrary to the scalar field approach (e.g., Chaplygin gas), the new approach leads to anisotropic pressure, raising the issues of stability of the isotropic solution under anisotropic perturbations and, being it stable, how the anisotropies evolve. In this work, the Eddington-Born-Infeld proposal is extended to a Bianchi type I scenario and residual post-inflationary anisotropies are shown to decay in time. Moreover, it is shown that the shears decay following a damped oscillatory pattern, instead of the standard exponential-like decay. Allowing for some fine tuning on the initial conditions, standard theoretical bounds on the shears can be avoided.

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