Gravitational particle production in braneworld cosmology

Details Gravitational particle production in braneworld cosmology Gravitational particle production in braneworld cosmology

2007-05-15

arxiv.org/abs/0705.2176v3

Phys.Rev.Lett.99:191302,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 1 figure, v3 with new definition of $\Lambda$ and minor text modifications

Scientific paper

10.1103/PhysRevLett.99.191302

Gravitational particle production in time variable metric of an expanding universe is efficient only when the Hubble parameter $H$ is not too small in comparison with the particle mass. In standard cosmology, the huge value of the Planck mass $M_{Pl}$ makes the mechanism phenomenologically irrelevant. On the other hand, in braneworld cosmology the expansion rate of the early universe can be much faster and many weakly interacting particles can be abundantly created. Cosmological implications are discussed.

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