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

Bin Hong; Huan-Yu Jia; Xue-Ling Mu; Xia Zhou

doi:10.1088/1674-1137/40/6/065101

Chinese Physics C> 2016, Vol. 40> Issue(6) : 065101 DOI: 10.1088/1674-1137/40/6/065101

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

1.
Institute for Modern Physics, Southwest Jiaotong University, Chengdu 610031, China

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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 g_U 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 g_U 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 g_U, and the gravitational redshift varies approximately inversely with g_U.
- massive protoneutron star ,
- relativistic mean field theory ,
- U bosons ,
- equation of state

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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

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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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沈阳化工大学材料科学与工程学院沈阳 110142

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

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

Corresponding author: Huan-Yu Jia,

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