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2024年10月30日

Influence of the weakly interacting light U boson on the properties of massive protoneutron stars

  • Considering the octet baryons in relativistic mean field theory and selecting entropy per baryon S=1, we calculate and discuss the influence of U bosons on the equation of state, mass-radius, moment of inertia and gravitational redshift of massive protoneutron stars (PNSs). The effective coupling constant gU of U bosons and nucleons is selected from 0 to 70 GeV-2. The results indicate that U bosons will stiffen the equation of state (EOS). The influence of U bosons on the pressure is more obvious at low density than high density, while the influence of U bosons on the energy density is more obvious at high density than low density. The U bosons play a significant role in increasing the maximum mass and radius of PNS. When the value of gU changes from 0 to 70 GeV-2, the maximum mass of a massive PNS increases from 2.11M to 2.58M, and the radius of a PNS corresponding to PSR J0348+0432 increases from 13.71 km to 24.35 km. The U bosons will increase the moment of inertia and decrease the gravitational redshift of a PNS. For the PNS of the massive PSR J0348+0432, the radius and moment of inertia vary directly with gU, and the gravitational redshift varies approximately inversely with gU.
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Bin Hong, Huan-Yu Jia, Xue-Ling Mu and Xia Zhou. Influence of the weakly interacting light U boson on the properties of massive protoneutron stars[J]. Chinese Physics C, 2016, 40(6): 065101. doi: 10.1088/1674-1137/40/6/065101
Bin Hong, Huan-Yu Jia, Xue-Ling Mu and Xia Zhou. Influence of the weakly interacting light U boson on the properties of massive protoneutron stars[J]. Chinese Physics C, 2016, 40(6): 065101.  doi: 10.1088/1674-1137/40/6/065101 shu
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Received: 2015-11-30
Revised: 2016-01-25
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    Supported by National Natural Science Foundation of China (11175147)

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Influence of the weakly interacting light U boson on the properties of massive protoneutron stars

    Corresponding author: Huan-Yu Jia,
  • 1. Institute for Modern Physics, Southwest Jiaotong University, Chengdu 610031, China
Fund Project:  Supported by National Natural Science Foundation of China (11175147)

Abstract: Considering the octet baryons in relativistic mean field theory and selecting entropy per baryon S=1, we calculate and discuss the influence of U bosons on the equation of state, mass-radius, moment of inertia and gravitational redshift of massive protoneutron stars (PNSs). The effective coupling constant gU of U bosons and nucleons is selected from 0 to 70 GeV-2. The results indicate that U bosons will stiffen the equation of state (EOS). The influence of U bosons on the pressure is more obvious at low density than high density, while the influence of U bosons on the energy density is more obvious at high density than low density. The U bosons play a significant role in increasing the maximum mass and radius of PNS. When the value of gU changes from 0 to 70 GeV-2, the maximum mass of a massive PNS increases from 2.11M to 2.58M, and the radius of a PNS corresponding to PSR J0348+0432 increases from 13.71 km to 24.35 km. The U bosons will increase the moment of inertia and decrease the gravitational redshift of a PNS. For the PNS of the massive PSR J0348+0432, the radius and moment of inertia vary directly with gU, and the gravitational redshift varies approximately inversely with gU.

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