Baryogenesis at Low Reheating Temperatures

Details Baryogenesis at Low Reheating Temperatures Baryogenesis at Low Reheating Temperatures

2000-01-28

arxiv.org/abs/hep-ph/0001301v2

Phys.Rev.Lett. 84 (2000) 4284-4287

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, version to appear in PRL: references added, new title

Scientific paper

10.1103/PhysRevLett.84.4284

We note that the maximum temperature during reheating can be much greater than the reheating temperature $T_r$ at which the Universe becomes radiation dominated. We show that the Standard Model anomalous $(B+L)$-violating processes can therefore be in thermal equilibrium for 1 GeV $\simlt T_{r}\ll 100$ GeV. Electroweak baryogenesis could work and the traditional upper bound on the Higgs mass coming from the requirement of the preservation of the baryon asymmetry may be relaxed. Alternatively, the baryon asymmetry may be reprocessed by sphaleron transitions either from a $(B-L) $ asymmetry generated by the Affleck-Dine mechanism or from a chiral asymmetry between $e_R$ and $e_L$ in a $B-L = 0$ Universe. Our findings are also relevant to the production of the baryon asymmetry in large extra dimension models.

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