Nuclear Physics Colloquium

Venue: Physics Building, Max-von-Laue-Str. 1, Seminar Room PHYS 2.116
Time: Friday, September 30, 3:00 pm (s.t.)
Contact: hees@fias.uni-frankfurt.de

SU(3) & SU(4) linear $\sigma$ model

Abdel Nasser Tawfik (Egyptian Center for Theoretical Physis, Cairo)

I'll present recent studies utilizing mean field approximations of the extended linear $\sigma$ model for the cases of three and four quark flavors at finite temperatures, baryon chemical potentials and magnetic/electric field strengths. This model includes (pseudo)scalar and (axial)vector degrees of freedom and assumes a global chiral symmetry. Most of the parameters of the model have been well determined by fitting to experiments and to recent lattice QCD simulations. With the Polyakov-loop potentials, the model combines with the deconfinement phase transition, as well. The dynamics of color charges was integrated as a new type of interaction. Four topics shall be presented, namely, viscosity, conductivity and phenomenology of fluctuations and correlations in QCD matter besides the phase structure of the model. The results shall be confronted to available measurements and lattice calculations.