Charge Fluctuations along the QCD phase boundary

Abstract

We discuss the properties of the net--quark and isovector fluctuations along the chiral phase transition line in the plane spanned by temperature and baryon chemical potential. Our results are obtained in terms of the Nambu--Jona-Lasinio (NJL) model within the mean-field approximation. The model is formulated at the finite temperature and for non-vanishing net--quark and the isospin chemical potentials. The fermion interactions are controlled by the strength of the scalar and vector couplings in the iso-scalar and iso-vector channels of constituent quarks. We explore properties and differences in the behavior of the net--quark number and isovector susceptibilities for different values of thermal parameters near the phase transition. We argue that any non-monotonic behavior of the net--quark number susceptibility along the phase transition boundary is an excellent probe of the existence and the position of the second order endpoint in the QCD phase diagram.

8 pages, 4 figures, to appear in the proceedings of International Conference on Strangeness in Quark Matter (SQM2006), Los Angeles, California, 26-31 Mar 2006

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Cited by in corpus (8)

• Susceptibilities and the Phase Structure of a Chiral Model with Polyakov Loops
• Density fluctuations in the presence of spinodal instabilities
• Chiral phase transition in the presence of spinodal decomposition
• Effects of kinematic cuts on net-electric charge fluctuations
• Net-baryon number variance and kurtosis within nonequilibrium chiral fluid dynamics
• Density fluctuations and chiral phase transition
• QCD phase diagram and charge fluctuations
• SQM 2006: Theory Summary and Perspectives