Gauss-Bonnet braneworld cosmological effect on relic density of dark matter

Details Gauss-Bonnet braneworld cosmological effect on relic density of dark matter Gauss-Bonnet braneworld cosmological effect on relic density of dark matter

2009-03-13

arxiv.org/abs/0903.2384v2

Phys.Rev.D79:103528,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, 2 figures, new references were added, some typos were corrected

Scientific paper

10.1103/PhysRevD.79.103528

In Gauss-Bonnet braneworld cosmology, the Friedmann equation of our four-dimensional universe on 3-brane is modified in a high energy regime (Gauss-Bonnet regime), while the standard expansion law is reproduced in low energies (standard regime). We investigate the Gauss-Bonnet braneworld cosmological effect on the thermal relic density of cold dark matter when the freeze-out of the dark matter occurs in the Gaugss-Bonnet regime. We find that the resultant relic density is considerably reduced when the transition temperature, which connects the Gauss-Bonnet regime with the standard regime, is low enough. This result is in sharp contrast with the result previously obtained in the Randall-Sundrum braneworld cosmology, where the relic density is enhanced.

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