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

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

    Corresponding author: YU Zi,

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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