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

Abstract
HTML
Reference
Related

PDF

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 Ξ ⁰can 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.

References

[1]

Page D, Lattimer J M, Prakash M et al. ApJS, 2004, 155: 6232 Heinke C O, Jonker P G, Wijnands R et al. ApJ, 2007, 660: 14243 Lattimer J M, Pethick C J, Prakash M et al. Phys. Rev. Lett., 1991, 66: 27014 Kubis S, Kutschera M. Nucl. Phys. A, 2003, 720:1895 Prakash M, Prakash M, Lattimer J M et al. ApJ, 1992, 390: L776 Kubis S. Phys. Rev. C, 2006, 73:0158057 DING W B, LIU G Z, ZHU M F et al. AA, 2009, 506: L13-L168 Yakovlev D G, Kaminker A D, Gnedin O Y et al. Phys. Rep., 2001, 354: 19 Leinson L B. Nucl. Phys. A, 2002, 707: 54310 LIU B, Greco V, Baran V et al. Phys. Rev. C, 2002, 65: 04520111 Kubis S, Kutschera M. Phys. Lett. B, 1997, 399: 19112 GUO H, CHEN Y J, LIU B et al. Phys. Rev. C, 2003, 68: 03580313 Menezes D P, Provid^encia C. Phys. Rev. C, 2004, 70: 05880114 WEI F X, MAO G J, KO C M et al. J. Phys. G, 2006, 32: 4715 LIU B, GUO H, Toro M D et al. Eur. Phys. J. A, 2005, 25: 29316 LIU B, Toro M D, Greco V et al. Phys. Rev. C, 2007, 75: 04880117 YU Z, LIU G Z, ZHU M F et al. Chin. Phys. Lett., 2009, 26: 02260118 Haensel P, Gnedie O Y. Astron. Astrophysics, 1994, 290: 458-46219 Batty C J, Friedman E, Gal A et al. Phys. Lett. B, 1994, 335: 27320 Balberg S, Gal A, Scha ner J. Prog. Theor. Phys. Suppl, 1994, 117: 32521 Stoks V G J, Lee T S H. Phys. Rev. C, 1999, 60: 02400622 Parmar A N, White N E, Giommi P et al. APJ, 1986, 308: 19923 Jansen F, Lumb D, Altieri B et al. Astr. Astrophys, 2001, 365: L1

Access

Get Citation

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

RIS(for EndNote,Reference Manager,ProCite)

BibTex

Txt

Milestone

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

Article Metric

Article Views(4052)
PDF Downloads(447)
Cited by(0)

Policy on re-use

To reuse of subscription content published by CPC, the users need to request permission from CPC, unless the content was published under an Open Access license which automatically permits that type of reuse.

通讯作者:陈斌, bchen63@163.com

1.
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

YU Zi^,
DING Wen-Bo

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 Ξ⁰can 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.