QCD Critical Points and Their Associated Soft Modes

Details QCD Critical Points and Their Associated Soft Modes QCD Critical Points and Their Associated Soft Modes

2010-09-23

arxiv.org/abs/1009.4534v1

Prog.Theor.Phys.Suppl.186:447-454,2010

Physics

Nuclear Physics

Nuclear Theory

8 pages, 3 figures. Talk presented at Yukawa International workshop "New Frontiers in QCD 2010 --- Exotic Hadron Systems and D

Scientific paper

10.1143/PTPS.186.447

The mean-field level calculation shows that the QCD matter can have multiple critical points incorporating the color superconductivity under charge neutrality constraint due to the repulsive vector interaction; this actually implies that the QCD matter is very soft for a simultaneous formation of diquark and chiral condensates coupled with the baryonic density. Dynamical density fluctuations are analyzed as possible soft modes around the QCD critical point using dissipative relativistic fluid dynamics. It is found that the entropy fluctuation solely gets enhanced while the sound modes due to mechanical density fluctuations are strongly attenuated around the QCD CP, which may suggest a suppression or even total disappearance of Mach cone at the CP.

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