Aug 12 – 18, 2012
US/Eastern timezone

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Extruction of nontrivial correlation between chiral and deconfinement transitions from two-color QCD at imaginary chemical potential

Aug 16, 2012, 4:00 PM
Regency 1/3 and Ambassador

Regency 1/3 and Ambassador

Poster Exploring the QCD phase diagram Poster Session Reception


Kouji Kashiwa (RIKEN BNL Research Center)


We investigate the nontrivial correlation between the chiral and deconfinement transition in the two-color QCD. To extract the information, the imaginary chemical potential is taken into account. At $\theta = \pi/2$ where $\theta$ is the imaginary chemical potential divided by the temperature, there is the exact nontrivial center symmetry which is the $Z_2$ symmetry and this symmetry can be spontaneously broken. This behavior is quite different form the three-color QCD because the nontrivial center symmetry is always broken by the quark degree of freedom in the three-color QCD. This means that we can investigate the nontrivial correlation between the chiral and deconfinement transitions in the two-color system clearly than that in the three-color system. Such nontrivial correlation is very important to construct the effective model of QCD and thus we can expect that several important model constraints are obtained from the two-color QCD analysis. In this study, we mainly pay attention to the behavior of the Roberge-Weiss (RW) endpoint which appears at $\theta=\pi/2$ in the tho-color system. We show that the RW endpoint is second-order if the nontrivial correlation is weak, but it turn into first-order when the nontrivial correlation is sufficiently strong.

Primary author

Kouji Kashiwa (RIKEN BNL Research Center)


Prof. Hiroaki KOUNO (Saga University) Prof. Masanobu YAHIRO (Kyushu University) Mr Takahiro SASAKI (Kyushu University)

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