Chiral phase transition at high temperature and density in the QCD-like theory

O. Kiriyama, M. Maruyama, F. Takagi

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23 Citations (Scopus)


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 Tc=129 MeV for μ=0 and a first-order one at μc =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 languageEnglish
Article number105008
Pages (from-to)1-6
Number of pages6
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number10
Publication statusPublished - 2000 Nov 15
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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