Precursory Phenomena of QCD Phase
Transitions in Hot and Dense Matter
Teiji Kunihiro (Kyoto University)
The talk consists of two parts. In the first part, I discuss possible
scenarios of the way how chiral restoration manifests itself in
the spectral functions in hadron channels, partly based on our
recent work
P. Gubler, T. K. and S. H. Lee, PLB 767(2017) 336
DOI:
10.1016/j.physletb.2017.01.077
The second part is devoted to clarifying the nature and the properties
of the soft mode of the QCD Z2 critical point(CP) on the basis of
the functional renormalization group method (FRG). It is shown that the
spectral function in the scalar channel shows a tachyonic
behavior at finite momenta prior to the CP, which is interpreted to
suggest that the assumed equilibrium state is unstable toward a state
with an inhomogeneous chiral condensate. This part is based on the
following two papers by the same authors:
arXiv:1707.05520 [hep-ph]
Nuclear Physics Colloquium