Bochum 1998 – wissenschaftliches Programm

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HK: Hadronen und Kerne

HK 55: Structure of Baryons, Mesons VIII, Theory

HK 55.5: Vortrag

Mittwoch, 18. März 1998, 15:30–15:45, J

Deconfinement and hadron properties at finite chemical potential — •S. Schmidt¹ and C.D. Roberts² — ¹Fachbereich Physik, Universit"at Rostock, D-18051 Rostock — ²Physics Division, Bldg. 203, Argonne National Laboratory, Argonne IL 60439-4843, USA

We study the equilibrium thermodynamics of a simple, confining Dyson-Schwinger- equation-model of 2-flavour QCD at finite temperature and chemical potential¹. The phase boundary between the confined and deconfined phases is defined by the zero of the vacuum-pressure difference. Chiral symmetry restoration and deconfinement are coincident with the transition being of first order, except for µ=0, where it is second order^1,2. Nonperturbative modifications of the dressed-quark propagator persist into the deconfined domain. This entails that the Stefan-Boltzmann limit for the bulk thermodynamic quantities is attained only for large values of temperature and chemical potential.

We apply our model to the calculation of the quark condensate and hadronic properties, such as the m_π, f_π, π⁰ → γγ and m_ρ, and their dependence on temperature and density. Where a comparison is possible, our results confirm those obtained in numerical simulations of lattice-QCD. We note a tendency for quantities that increase with T to decrease with µ. ¹ D. Blaschke, C.D. Roberts and S. Schmidt, nucl-th/9706070. ² A. Bender, G.I. Poulis, C.D. Roberts, S. Schmidt and A.W. Thomas, nucl-th/9710069.