Speaker
Prof.
ettore vicari
(physics department, university of Pisa)
Description
The dependence of 4D SU(N) gauge theories on the topological theta
term is investigated at finite temperature, and in particular in the
large-N limit. General arguments and numerical analyses exploiting
the lattice formulation show that it drastically changes across the
deconfinement transition. The low-T phase is characterized by a
large-N scaling with theta/N as relevant variable, while in the high-T
phase the scaling variable is just theta and the free energy is
essentially determined by the instanton-gas approximation.
