Electroweak baryogenesis by black holes

We propose a new scenario of the electroweak baryogenesis based on the properties of electroweak domain walls surrounding black holes in the Higgs phase vacuum of the extended standard model with two-Higgs doublets. It is shown that there exists electroweak domain walls and symmetric regions surrounding black holes and that the Hawking radiation of the black holes can produce a nonzero baryon number density. The scenario can explain the origin of the baryon number in our Universe even without the assumption of the existence of the first order electroweak phase transition. [S0556-2821(99)50302-0].