"Hot and dense QCD: lattice results confront analytic calculation"
Relatore: Dr.ssa Maria Paola Lombardo- INFN, Laboratori Nazionali di Frascati
08 Febbraio 2005 ore 15.30
|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 of order 0.95*T_c, and approach
a free field behaviour with a reduced effective number of
flavor for T greater than 1.5*T_c$; chiral symmetry and
confinement are interrelated, and we note analogies between
the critical line of QCD and that of random matrix models,
and models with a four fermion interaction with the same