Effects of the δ meson on the direct Urca processes in neutron stars

YU Zi; DING Wen-Bo

doi:10.1088/1674-1137/35/9/004

Chinese Physics C> 2011, Vol. 35> Issue(9) : 812-816 DOI: 10.1088/1674-1137/35/9/004

Effects of the δ meson on the direct Urca processes in neutron stars

YU Zi ^, ,
DING Wen-Bo

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In the framework of the relativistic mean field theory, the effects of the δ meson on the direct Urca (DURCA) processes are investigated. In a neutron star, the DURCA processes involving nucleons, Λ and Ξ^- can take place while the process involving the Ξ⁰ can not. With the inclusion of the δ meson, the threshold densities for the DURCA processes become lower. With the δ included, the threshold neutron star mass for the DURCA process among nucleons and electrons becomes smaller while the threshold masses for the processes involving hyperons become larger. When the δ meson is included, the total neutrino emissivity remarkably increases in the density range of 0.32--0.41 fm^-3. The total neutrino luminosity increases with the neutron star mass first and then decreases. The neutrino luminosity gets larger with the inclusion of the δ meson. The cooling of the EXO0748-676 is sensitive to the isovector scalar interaction.

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YU Zi and DING Wen-Bo. Effects of the δ meson on the direct Urca processes in neutron stars[J]. Chinese Physics C, 2011, 35(9): 812-816. doi: 10.1088/1674-1137/35/9/004

YU Zi and DING Wen-Bo. Effects of the δ meson on the direct Urca processes in neutron stars[J]. Chinese Physics C, 2011, 35(9): 812-816. doi: 10.1088/1674-1137/35/9/004 shu

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Received: 2010-11-08
Revised: 2010-12-30

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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

Effects of the δ meson on the direct Urca processes in neutron stars

Corresponding author: YU Zi,

Received Date: 2010-11-08

Accepted Date: 2010-12-30

Available Online: 2011-09-05

Abstract: In the framework of the relativistic mean field theory, the effects of the δ meson on the direct Urca (DURCA) processes are investigated. In a neutron star, the DURCA processes involving nucleons, Λ and Ξ^- can take place while the process involving the Ξ⁰ can not. With the inclusion of the δ meson, the threshold densities for the DURCA processes become lower. With the δ included, the threshold neutron star mass for the DURCA process among nucleons and electrons becomes smaller while the threshold masses for the processes involving hyperons become larger. When the δ meson is included, the total neutrino emissivity remarkably increases in the density range of 0.32--0.41 fm^-3. The total neutrino luminosity increases with the neutron star mass first and then decreases. The neutrino luminosity gets larger with the inclusion of the δ meson. The cooling of the EXO0748-676 is sensitive to the isovector scalar interaction.

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Effects of the δ meson on the direct Urca processes in neutron stars

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