Randall-Sundrum brane cosmology: modification of late-time cosmic dynamics by exotic matter

Details Randall-Sundrum brane cosmology: modification of late-time cosmic dynamics by exotic matter Randall-Sundrum brane cosmology: modification of late-time cosmic dynamics by exotic matter

2010-06-06

arxiv.org/abs/1006.1122v4

Class.Quant.Grav.28:105017,2011

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Latex, 12 pages, 9 eps figures. Title changed, discussion improved. Version that matches the one published in CQG

Scientific paper

10.1088/0264-9381/28/10/105017

In this paper we show, through the study of concrete examples, that, depending on the cosmic dynamics of the energy density of matter degrees of freedom living in the brane, Randall-Sundrum (RS) brane effects can be important not only at short distances (UV regime), but also at large cosmological scales (IR regime). Our first example relies on the study, by means of the dynamical systems tools, of a toy model based in a non-linear electrodynamics (NLED) Lagrangian. Then we show that other, less elaborated models, such as the inclusion of a scalar phantom field, and of a tachyon phantom field -- trapped in the brane -- produce similar results. The form of the RS correction seems to convert what would have been future attractors in general relativity into saddle points. The above "mixing of scales" effect is distinctive only of theories that modify the right-hand-side (matter part) of the Friedmann equation, so that, for instance, DGP-brane models do not show this feature.

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