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Effects of δ Meson on Thermal Protoneutron Star Matter |
| YU Zi1, LIU Guang-Zhou1, ZHU Ming-Feng1, XU Yan1, ZHAO En-Guang2 |
| 1Department of Physics, Jilin University, Changchun 1300212Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190 |
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YU Zi, LIU Guang-Zhou, ZHU Ming-Feng et al 2009 Chin. Phys. Lett. 26 022601 |
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Abstract In the framework of the relativistic mean field theory, the effects of the δ meson on protoneutron star matter with hyperons at finite temperature are investigated. In thermal protoneutron star matter, the δ field potential increases with density first and then decreases. Fixing the density, the increase of the temperature suppresses the δ field potential. With the inclusion of the δ meson, the threshold densities for hyperons become lower and the abundance of trapped neutrinos decreases. The most important effect of the δ meson is to increase the abundance of hyperons in the inner core range of protoneutron stars. With the rise of the temperature, the density range where the δ meson plays an important role is narrowed and the effects of the δ meson are suppressed. Moreover, the protoneutron star mass and radius are nearly not affected by the δ meson
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| Keywords:
26.60.+c
24.10.Jv
21.65.+f
21.30.Fe
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Received: 25 November 2008
Published: 20 January 2009
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