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Seminario
"Hot and dense QCD : lattice results confront analytic calculations"

Relatore: Dr.ssa Maria Paola Lombardo- LNF INFN, Frascati
Note: SEMINARIO RINVIATO A DATA DA DESTINARSI

Sala Feynman
26 Ottobre 2004 ore 14.30

Abstract
We review the imaginary chemical potential approach to QCD thermodynamics, and discuss lattice results on four flavor QCD at nonzero temperature and baryon density. We exploit analytic continuation either from imaginary to real chemical potential, and from real to imaginary chemical potential. The result compare well with the hadron resonance gas model up to T ~ 0.95 T_c, and approach a free field behaviour with a reduced effective number of flavor for T >= 1.5 T_c; chiral symmetry and confinement are interrelated, and we note analogies between the critical line of QCD and that of simple models with the same global symmetries.