Non-Abelian Einstein-Born-Infeld-Dilaton Cosmology

Details Non-Abelian Einstein-Born-Infeld-Dilaton Cosmology Non-Abelian Einstein-Born-Infeld-Dilaton Cosmology

2005-11-16

arxiv.org/abs/gr-qc/0511090v2

Phys.Rev.D73:023520,2006

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

31 pages, 9 figures, minor changes, accepted for publication in Phys. Rev. D15

Scientific paper

10.1103/PhysRevD.73.023520

The non-abelian Einstein-Born-Infeld-Dilaton theory, which rules the dynamics of tensor-scalar gravitation coupled to a $su(2)$-valued gauge field ruled by Born-Infeld lagrangian, is studied in a cosmological framework. The microscopic energy exchange between the gauge field and the dilaton which results from a non-universality of the coupling to gravity modifies the usual behaviour of tensor-scalar theories coupled to matter fluids. General cosmological evolutions are derived for different couplings to gravitation and a comparison to universal coupling is highlighted. Evidences of cosmic acceleration are presented when the evolution is interpreted in the Jordan physical frame of a matter respecting the weak equivalence principle. The importance for the mechanism of cosmic acceleration of the dynamics of the Born-Infeld gauge field, the attraction role of the matter fluid and the non-universality of the gravitational couplings is briefly outlined.

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