1-13
Progress of Theoretical Physics Supplement No. 174 (2008) pp. 1-13
URL :
http://ptp.ipap.jp/link?PTPS/174/1/
DOI : 10.1143/PTPS.174.1
Hot and Dense Hadronic Matter
— Selected Topics
—
Wolfram Weise
Physik-Department, Technische Universität München,
D-85747 Garching, Germany
Recent developments in the area of hadronic and quark-gluon
matter under extreme conditions are surveyed. A prime topic is the
possible interplay of chiral and deconfinement transitions in QCD.
The symmetry breaking pattern of QCD features two seemingly disconnected
phenomena: the spontaneous breakdown of the Z (3) center symmetry
in the deconfinement transition of pure-gauge QCD, and the spontaneous
breaking of chiral S U (N f ) ×S U (N f ) symmetry in the limit of
N f massless quark flavors.
The dynamical entanglement of these symmetries is discussed in the
framework of a schematic model (the PNJL model) in comparison with
results from lattice QCD. The QCD phase diagram is also explored from
this viewpoint, with emphasis on the (uncertain) location of the
critical point. Aspects of compressed baryonic matter at zero
temperature and its nuclear physics connection are sketched in
view of new results for the density dependence of the chiral condensate.
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