Baryogenesis at low reheating temperatures

We note that the maximum temperature during reheating can be much greater t han the reheating temperature T-r at which the universe becomes radiation d ominated. We show that the standard model anomalous (B + L)-violating proce sses can therefore be in thermal equilibrium for 1 GeV less than or similar to T-r much less than 100 GeV. Electroweak baryogenesis could work and the traditional upper bound on the Higgs mass coming from the requirement of t he 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.