dorsal/arxiv
View SchemaCold, dense nuclear matter in a SU(2) parity doublet model
| Authors | D. Zschiesche, L. Tolos, Jürgen Schaffner-Bielich, Robert D. Pisarski |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0608044 |
| URL | https://arxiv.org/abs/nucl-th/0608044 |
| DOI | 10.1103/PhysRevC.75.055202 |
| Journal | Phys.Rev.C75:055202,2007 |
Abstract
We study dense nuclear matter and the chiral phase transition in a SU(2) parity doublet model at zero temperature. The model is defined by adding the chiral partner of the nucleon, the N', to the linear sigma model, treating the mass of the N' as an unknown free parameter. The parity doublet model gives a reasonable description of the properties of cold nuclear matter, and avoids unphysical behaviour present in the standard SU(2) linear sigma model. If the N' is identified as the N'(1535), the parity doublet model shows a first order phase transition to a chirally restored phase at large densities, $\rho \approx 10 \rho_0$, defining the transition by the degeneracy of the masses of the nucleon and the N'. If the mass of the N' is chosen to be 1.2 GeV, then the critical density of the chiral phase transition is lowered to three times normal nuclear matter density, and for physical values of the pion mass, the first order transition turns into a smooth crossover.
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"abstract": "We study dense nuclear matter and the chiral phase transition in a SU(2)\nparity doublet model at zero temperature. The model is defined by adding the\nchiral partner of the nucleon, the N\u0027, to the linear sigma model, treating the\nmass of the N\u0027 as an unknown free parameter. The parity doublet model gives a\nreasonable description of the properties of cold nuclear matter, and avoids\nunphysical behaviour present in the standard SU(2) linear sigma model. If the\nN\u0027 is identified as the N\u0027(1535), the parity doublet model shows a first order\nphase transition to a chirally restored phase at large densities, $\\rho \\approx\n10 \\rho_0$, defining the transition by the degeneracy of the masses of the\nnucleon and the N\u0027. If the mass of the N\u0027 is chosen to be 1.2 GeV, then the\ncritical density of the chiral phase transition is lowered to three times\nnormal nuclear matter density, and for physical values of the pion mass, the\nfirst order transition turns into a smooth crossover.",
"arxiv_id": "nucl-th/0608044",
"authors": [
"D. Zschiesche",
"L. Tolos",
"J\u00fcrgen Schaffner-Bielich",
"Robert D. Pisarski"
],
"categories": [
"nucl-th"
],
"doi": "10.1103/PhysRevC.75.055202",
"journal_ref": "Phys.Rev.C75:055202,2007",
"title": "Cold, dense nuclear matter in a SU(2) parity doublet model",
"url": "https://arxiv.org/abs/nucl-th/0608044"
},
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