Neutron star cooling in various sets of nucleon coupling constants

DING Wen-Bo; YU Zi; MI Geng; WANG Chun-Yan

doi:10.1088/1674-1137/37/5/055101

Chinese Physics C> 2013, Vol. 37> Issue(5) : 055101 DOI: 10.1088/1674-1137/37/5/055101

Neutron star cooling in various sets of nucleon coupling constants

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Abstract：
The influences of nucleon coupling constants on the neutrino scatting and cooling properties of neutron stars are investigated. The results in the GM1, GPS250 and NL-SH parameter sets show that the magnitude of the neutrino emissivity and density ranges where the dUrca process of nucleons is allowed differ obviously between the three parameter sets in nucleon-only and hyperonic matter. Furthermore, the neutron stars in the GPS250 set cool very quickly, whereas those in the NL-SH set cool slowly. The cooling rate of the former can be almost three times more that of the latter. It can be concluded that the stiffer the equation of state, the slower the corresponding neutron stars cool. The hyperon Λ makes neutrino emissivity due to the direct Urca process of nucleons lower compared with nucleon-only matter, and postpones the dUrca process with muons. However, these Λ effects are relatively weaker in the GPS250 set than in the GM1 set.

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DING Wen-Bo, YU Zi, MI Geng and WANG Chun-Yan. Neutron star cooling in various sets of nucleon coupling constants[J]. Chinese Physics C, 2013, 37(5): 055101. doi: 10.1088/1674-1137/37/5/055101

DING Wen-Bo, YU Zi, MI Geng and WANG Chun-Yan. Neutron star cooling in various sets of nucleon coupling constants[J]. Chinese Physics C, 2013, 37(5): 055101. doi: 10.1088/1674-1137/37/5/055101 shu

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Received: 2012-06-06
Revised: 1900-01-01

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Neutron star cooling in various sets of nucleon coupling constants

Corresponding author: DING Wen-Bo,

Corresponding author: YU Zi,

Received Date: 2012-06-06

Accepted Date: 1900-01-01

Available Online: 2013-05-05

Abstract: The influences of nucleon coupling constants on the neutrino scatting and cooling properties of neutron stars are investigated. The results in the GM1, GPS250 and NL-SH parameter sets show that the magnitude of the neutrino emissivity and density ranges where the dUrca process of nucleons is allowed differ obviously between the three parameter sets in nucleon-only and hyperonic matter. Furthermore, the neutron stars in the GPS250 set cool very quickly, whereas those in the NL-SH set cool slowly. The cooling rate of the former can be almost three times more that of the latter. It can be concluded that the stiffer the equation of state, the slower the corresponding neutron stars cool. The hyperon Λ makes neutrino emissivity due to the direct Urca process of nucleons lower compared with nucleon-only matter, and postpones the dUrca process with muons. However, these Λ effects are relatively weaker in the GPS250 set than in the GM1 set.

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Neutron star cooling in various sets of nucleon coupling constants

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