Speaker
Dr
Takashi UMEDA
(Hiroshima Univ.)
Description
We study scaling behavior of a chiral order parameter in the low density
region, performing a simulation of two-flavor lattice QCD with improved
Wilson quarks. It have been confirmed that the scaling behavior of the
chiral order parameter defined by a Ward-Takahashi identity agrees with
the scaling function of the three-dimensional O(4) spin model at zero
chemical potential. We discuss the scaling properties of the chiral
phase transition at finite density, applying the reweighting method and
calculating derivatives of the chiral order parameter with respect to
the chemical potential. In the comparison between the scaling functions
of the O(4) spin model and QCD at low density, there is a fit parameter
which can be interpreted as the curvature of the chiral phase transition
curve in the QCD phase diagram with respect to temperature and chemical
potential. We determine the curvature of the phase boundary by the
fitting. The physical scale is set by the gradient flow.
Primary author
Dr
Takashi UMEDA
(Hiroshima Univ.)
Co-authors
Mr
Atsushi Uji
(Niigata University)
Dr
Hiroshi Ohno
(University of Tsukuba)
Prof.
Kazuyuki Kanaya
(CiRfSE, Univ. Tsukuba)
Mr
Naoki Wakabayashi
(Niigata University)
Mr
Ryo Iwami
(Niigata University)
Dr
Shinji Ejiri
(Niigata University)
Dr
Shinsuke Yoshida
(Central China Normal Univ.)
