Irradiated asymmetric Friedmann branes

Details Irradiated asymmetric Friedmann branes Irradiated asymmetric Friedmann branes

2006-01-29

arxiv.org/abs/hep-th/0601217v1

JCAP 0601 (2006) 022

Physics

High Energy Physics

High Energy Physics - Theory

27 pages, 12 figures

Scientific paper

10.1088/1475-7516/2006/01/022

We consider a Friedmann brane moving in a bulk impregnated by radiation. The setup is strongly asymmetric, with only one black hole in the bulk. The radiation emitted by this bulk black hole can be reflected, absorbed or transmitted through the brane. Radiation pressure accelerates the brane, behaving as dark energy. Absorption however generates a competing effect: the brane becomes heavier and gravitational attraction increases. We analyse the model numerically, assuming a total absorbtion on the brane for k=1. We conclude that due to the two competing effects, in this asymmetric scenario the Hawking radiation from the bulk black hole is not able to change the recollapsing fate of this brane-world universe. We show that for light branes and early times the radiation pressure is the dominant effect. In contrast, for heavy branes the self-gravity of the absorbed radiation is a much stronger effect. We find the critical value of the initial energy density for which these two effects roughly cancel each other.

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