A model for a dynamically induced large CP-violating phase

Assuming a new interaction with a $\theta$ term for the third generation of quarks, a value of $\theta$ different from zero dynamically induces the top- bottom mass splitting and a large CP-violating phase.Comment: 6 pages, latex, talk presented at the VI Workshop on Particles and Fields (21-27 Nov.1997 in Morelia Mich.,Mexico

Leptogenesis And Inflation

In this talk, we studied the implication of the constraint on the reheating temperature coming from the gravitino problem on models of leptogenesis. We point out that in supersymmetric extensions of the standard model, all existing models of neutrino masses and leptogenesis, except the one with right-handed singlet neutrinos are ruled out for a large range of the gravitino mass.Comment: talk given at the International Workshop on Strong and Electroweak Matter (Copenhagen, 2-5 December 1998). (5 pages, 1 figure and used sprocl.sty

Equivalence of the sine-Gordon and massive Thirring models at finite temperature

Using the path-integral approach, the quantum massive Thirring and sine-Gordon models are proven to be equivalent at finite temperature. This result is an extension of Coleman's proof of the equivalence between both theories at zero temperature. The usual identifications among the parameters of these models also remain valid at $T \neq 0$.Comment: 9 pages, standard LaTe