dorsal/arxiv
View SchemaDensity dependencies of interaction strengths and their influence on nuclear matter and neutron star in relativistic mean field theory
| Authors | S. F. Ban, J. Li, S. Q. Zhang, H. Y. Jia, J. P. Sang, J. Meng |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0402045 |
| URL | https://arxiv.org/abs/nucl-th/0402045 |
| DOI | 10.1103/PhysRevC.69.045805 |
| Journal | Phys.Rev. C69 (2004) 045805 |
Abstract
The density dependencies of various effective interaction strengths in the relativistic mean field are studied and carefully compared for nuclear matter and neutron stars. The influences of different density dependencies are presented and discussed on mean field potentials, saturation properties for nuclear matter, equations of state, maximum masses and corresponding radii for neutron stars. Though the interaction strengths and the potentials given by various interactions are quite different in nuclear matter, the differences of saturation properties are subtle, except for NL2 and TM2, which are mainly used for light nuclei, while the properties by various interactions for pure neutron matter are quite different. To get an equation of state for neutron matter without any ambiguity, it is necessary to constrain the effective interactions either by microscopic many-body calculations for the neutron matter data or the data of nuclei with extreme isospin. For neutron stars, the interaction with large interaction strengths give strong potentials and large Oppenheimer-Volkoff (OV) mass limits. The density-dependent interactions DD-ME1 and TW-99 favor a large neutron population due to their weak $\rho$-meson field at high densities. The OV mass limits calculated from different equations of state are 2.02 $\sim$ 2.81$ M_\odot$, and the corresponding radii are 10.78 $\sim$ 13.27 km. After the inclusion of the hyperons, the corresponding values become 1.52 $\sim$ 2.06 $M_\odot$ and 10.24 $\sim$ 11.38 km.
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"abstract": "The density dependencies of various effective interaction strengths in the\nrelativistic mean field are studied and carefully compared for nuclear matter\nand neutron stars. The influences of different density dependencies are\npresented and discussed on mean field potentials, saturation properties for\nnuclear matter, equations of state, maximum masses and corresponding radii for\nneutron stars. Though the interaction strengths and the potentials given by\nvarious interactions are quite different in nuclear matter, the differences of\nsaturation properties are subtle, except for NL2 and TM2, which are mainly used\nfor light nuclei, while the properties by various interactions for pure neutron\nmatter are quite different. To get an equation of state for neutron matter\nwithout any ambiguity, it is necessary to constrain the effective interactions\neither by microscopic many-body calculations for the neutron matter data or the\ndata of nuclei with extreme isospin. For neutron stars, the interaction with\nlarge interaction strengths give strong potentials and large\nOppenheimer-Volkoff (OV) mass limits. The density-dependent interactions DD-ME1\nand TW-99 favor a large neutron population due to their weak $\\rho$-meson field\nat high densities. The OV mass limits calculated from different equations of\nstate are 2.02 $\\sim$ 2.81$ M_\\odot$, and the corresponding radii are 10.78\n$\\sim$ 13.27 km. After the inclusion of the hyperons, the corresponding values\nbecome 1.52 $\\sim$ 2.06 $M_\\odot$ and 10.24 $\\sim$ 11.38 km.",
"arxiv_id": "nucl-th/0402045",
"authors": [
"S. F. Ban",
"J. Li",
"S. Q. Zhang",
"H. Y. Jia",
"J. P. Sang",
"J. Meng"
],
"categories": [
"nucl-th"
],
"doi": "10.1103/PhysRevC.69.045805",
"journal_ref": "Phys.Rev. C69 (2004) 045805",
"title": "Density dependencies of interaction strengths and their influence on nuclear matter and neutron star in relativistic mean field theory",
"url": "https://arxiv.org/abs/nucl-th/0402045"
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