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 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 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 |
Externally published | Yes |
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)