dorsal/arxiv
View SchemaRelativistic Mean-Field Models with Effective Hadron Masses and Coupling Constants, and rho^- Condensation
| Authors | E. E. Kolomeitsev, D. N. Voskresensky |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0410063 |
| URL | https://arxiv.org/abs/nucl-th/0410063 |
| DOI | 10.1016/j.nuclphysa.2005.05.154 |
| Journal | Nucl.Phys. A759 (2005) 373-413 |
Abstract
We study relativistic mean-field models with hadron masses and coupling constants depending self-consistently on a scalar meson field. We demonstrate that by the field redefinition some models can be equivalently transformed into each other. Thereby the large variety of scaling functions for masses and couplings can be reduced to a restricted set of functions with a constrained dependence on a scalar field. We show how by choosing properly the latter scaling functions one may stiffen or soften the equation of state at high densities and simultaneously increase the threshold density for the direct Urca process without any change of the description of nuclear matter close to the saturation density. The stiffening of the equation of state might be motivated by recent neutron star mass measurements, whereas the increase of the threshold density for the direct Urca process is required by the analysis of neutron star cooling data. We demonstrate that if a rho meson is included in a mean-field model as a non-Abelian gauge boson, then there is a possibility for a charged rho-meson condensation in dense nuclear matter. We show that such a novel phase can be realized in neutron star interiors already for sufficiently low densities, typically $\sim 3\div 4 n_0$, where $n_0$ is the nuclear saturation density. In the framework of the relativistic mean field model the new phase arises in a second-order phase transition. The appearance of a $\rho^-$ condensate significantly alters the proton fraction in a neutron star but changes moderately the equation of state. The neutrino emissivity of the processes involving a $\rho^-$ meson condensate is estimated.
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"abstract": "We study relativistic mean-field models with hadron masses and coupling\nconstants depending self-consistently on a scalar meson field. We demonstrate\nthat by the field redefinition some models can be equivalently transformed into\neach other. Thereby the large variety of scaling functions for masses and\ncouplings can be reduced to a restricted set of functions with a constrained\ndependence on a scalar field. We show how by choosing properly the latter\nscaling functions one may stiffen or soften the equation of state at high\ndensities and simultaneously increase the threshold density for the direct Urca\nprocess without any change of the description of nuclear matter close to the\nsaturation density. The stiffening of the equation of state might be motivated\nby recent neutron star mass measurements, whereas the increase of the threshold\ndensity for the direct Urca process is required by the analysis of neutron star\ncooling data. We demonstrate that if a rho meson is included in a mean-field\nmodel as a non-Abelian gauge boson, then there is a possibility for a charged\nrho-meson condensation in dense nuclear matter. We show that such a novel phase\ncan be realized in neutron star interiors already for sufficiently low\ndensities, typically $\\sim 3\\div 4 n_0$, where $n_0$ is the nuclear saturation\ndensity. In the framework of the relativistic mean field model the new phase\narises in a second-order phase transition. The appearance of a $\\rho^-$\ncondensate significantly alters the proton fraction in a neutron star but\nchanges moderately the equation of state. The neutrino emissivity of the\nprocesses involving a $\\rho^-$ meson condensate is estimated.",
"arxiv_id": "nucl-th/0410063",
"authors": [
"E. E. Kolomeitsev",
"D. N. Voskresensky"
],
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"doi": "10.1016/j.nuclphysa.2005.05.154",
"journal_ref": "Nucl.Phys. A759 (2005) 373-413",
"title": "Relativistic Mean-Field Models with Effective Hadron Masses and Coupling Constants, and rho^- Condensation",
"url": "https://arxiv.org/abs/nucl-th/0410063"
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