### Abstract

We consider a Friedmann brane moving in a bulk impregnated with radiation. The set-up is strongly asymmetric, with only one black hole in the bulk. The radiation emitted by this left 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 absorption 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.

Original language | English |
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Article number | 022 |

Journal | Journal of Cosmology and Astroparticle Physics |

Issue number | 1 |

DOIs | |

Publication status | Published - Jan 1 2006 |

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### Keywords

- Cosmological applications of theories with extra dimensions
- Cosmology with extra dimensions

### ASJC Scopus subject areas

- Physics and Astronomy(all)

### Cite this

**Irradiated asymmetric Friedmann branes.** / Gergely, L.; Keresztes, Z.

Research output: Contribution to journal › Article

}

TY - JOUR

T1 - Irradiated asymmetric Friedmann branes

AU - Gergely, L.

AU - Keresztes, Z.

PY - 2006/1/1

Y1 - 2006/1/1

N2 - We consider a Friedmann brane moving in a bulk impregnated with radiation. The set-up is strongly asymmetric, with only one black hole in the bulk. The radiation emitted by this left 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 absorption 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.

AB - We consider a Friedmann brane moving in a bulk impregnated with radiation. The set-up is strongly asymmetric, with only one black hole in the bulk. The radiation emitted by this left 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 absorption 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.

KW - Cosmological applications of theories with extra dimensions

KW - Cosmology with extra dimensions

UR - http://www.scopus.com/inward/record.url?scp=33645769481&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33645769481&partnerID=8YFLogxK

U2 - 10.1088/1475-7516/2006/01/022

DO - 10.1088/1475-7516/2006/01/022

M3 - Article

AN - SCOPUS:33645769481

JO - Journal of Cosmology and Astroparticle Physics

JF - Journal of Cosmology and Astroparticle Physics

SN - 1475-7516

IS - 1

M1 - 022

ER -