Constraining the QCD phase diagram by tricritical lines at imaginary chemical potential

Abstract

We present unambiguous evidence from lattice simulations of QCD with three degenerate quark species for two tricritical points in the (T,m) phase diagram at fixed imaginary μ/T=iπ/3 mod 2π/3, one in the light and one in the heavy mass regime. These represent the boundaries of the chiral and deconfinement critical lines continued to imaginary chemical potential, respectively. It is demonstrated that the shape of the deconfinement critical line for real chemical potentials is dictated by tricritical scaling and implies the weakening of the deconfinement transition with real chemical potential. The generalization to non-degenerate and light quark masses is discussed.

4 pages, 5 figures

References in corpus (5)

• The chiral critical point of Nf=3 QCD at finite density to the order (mu/T)^4
• The strongly interacting Quark Gluon Plasma, and the critical behaviour of QCD at imaginary chemical potential
• The order of the Roberge-Weiss endpoint (finite size transition) in QCD
• Roberge-Weiss phase transition and its endpoint
• The deconfinement transition of finite density QCD with heavy quarks from strong coupling series

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