dorsal/arxiv
View SchemaThe Phase Diagram of the Quark-Meson Model
| Authors | Bernd-Jochen Schaefer, Jochen Wambach |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0403039 |
| URL | https://arxiv.org/abs/nucl-th/0403039 |
| DOI | 10.1016/j.nuclphysa.2005.04.012 |
| Journal | Nucl.Phys. A757 (2005) 479-492 |
Abstract
Within the proper-time renormalization group approach, the chiral phase diagram of a two-flavor quark-meson model is studied. In the chiral limit, the location of the tricritical point which is linked to a Gaussian fixed point, is determined. For quark chemical potentials smaller than the tricritical one the second-order phase transition belongs to the O(4) universality class. For temperatures below the tricritical one we find initially a weak first-order phase transition which is commonly seen in model studies and also in recent lattice simulations. In addition, below temperatures of T <~ 17 MeV we find two phase transitions. The chiral restoration transition is initially also of first-order but turns into a second-order transition again. This leads to the possibility that there may be a "second tricritical" point in the QCD phase diagram in the chiral limit.
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"abstract": "Within the proper-time renormalization group approach, the chiral phase\ndiagram of a two-flavor quark-meson model is studied. In the chiral limit, the\nlocation of the tricritical point which is linked to a Gaussian fixed point, is\ndetermined. For quark chemical potentials smaller than the tricritical one the\nsecond-order phase transition belongs to the O(4) universality class. For\ntemperatures below the tricritical one we find initially a weak first-order\nphase transition which is commonly seen in model studies and also in recent\nlattice simulations. In addition, below temperatures of T \u003c~ 17 MeV we find two\nphase transitions. The chiral restoration transition is initially also of\nfirst-order but turns into a second-order transition again. This leads to the\npossibility that there may be a \"second tricritical\" point in the QCD phase\ndiagram in the chiral limit.",
"arxiv_id": "nucl-th/0403039",
"authors": [
"Bernd-Jochen Schaefer",
"Jochen Wambach"
],
"categories": [
"nucl-th",
"hep-ph",
"hep-th"
],
"doi": "10.1016/j.nuclphysa.2005.04.012",
"journal_ref": "Nucl.Phys. A757 (2005) 479-492",
"title": "The Phase Diagram of the Quark-Meson Model",
"url": "https://arxiv.org/abs/nucl-th/0403039"
},
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