## Abstract

The chiral phase transition at finite temperature T and/or chemical potential μ is studied using the QCD-like theory with a variational approach. The "QCD-like theory" means the improved ladder approximation with an infrared cutoff in terms of a modified running coupling. The form of the Cornwall-Jackiw-Tomboulis effective potential is modified by the use of the Schwinger-Dyson equation for a generally nonzero current quark mass. We then calculate the effective potential at finite T and/or μ and investigate the phase structure in the chiral limit. We have a second-order phase transition at T_{c}=129 MeV for μ=0 and a first-order one at μ_{c} =422 MeV for T=0. A tricritical point in the T-μ plane is found at T=107 MeV, μ=210 MeV. The position is close to that of the random matrix model and some version of the Nambu-Jona-Lasinio model.

Original language | English |
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Article number | 105008 |

Pages (from-to) | 1-6 |

Number of pages | 6 |

Journal | Physical Review D - Particles, Fields, Gravitation and Cosmology |

Volume | 62 |

Issue number | 10 |

DOIs | |

Publication status | Published - 2000 Nov 15 |

## ASJC Scopus subject areas

- Physics and Astronomy (miscellaneous)