弱相互作用轻U玻色子对有质量PNS性质的影响
Influence of the weakly interacting light U boson on the properties of massive PNS
摘要：
考虑相对论平均场论中的八重态重子，选取单位重子熵S=1，计算并讨论了U玻色子对大质量质子中子星的物态方程、质量半径、转动惯量和引力红移的影响. U玻色子与核子的有效耦合常数$g_{U}$选自0 GeV $^{-2}$ ~ 70 GeV $^{-2}$。结果表明，U玻色子将破坏物态方程。U玻色子对压力的影响在低密度时比高密度时更明显，而对能量密度的影响在高密度时比低密度时更明显。U玻色子在增加PNS的最大质量和半径方面起着重要作用。当$g_{U}$值从0 GeV $^{-2}$变为70 GeV $^{-2}$时，大质量PNS的最大质量从2.11 $M_{\odot}$增大到2.58 $M_{\odot}$，对应PSR J 0348 +0432的PNS半径从13.71 km增大到24.35 km. U玻色子将增加PNS的转动惯量，降低引力红移。对于大质量PSR J 0348 +0432的PNS，半径和转动惯量与$g_{U}$成正比，引力红移与$g_{U}$近似成反比。
英文摘要：
Considering the octet baryons in relativistic mean field theory and selecting entropy per baryon S=1, we calculate and discuss the influence of U boson on the equation of state, mass-radius, moment of inertia and gravitational redshift of massive protoneutron star (PNS). The effective coupling constant $g_{U}$ of U bosons and nucleons is selected from 0GeV$^{-2}$ to 70GeV$^{-2}$. The results point 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 0GeV$^{-2}$ to 70GeV$^{-2}$, the maximum mass of massive PNS increases from 2.11 $M_{\odot}$ to 2.58 $M_{\odot}$, and the radius of PNS corresponding 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 PNS. For PNS of the massive PSR J0348+0432, the radius and moment of inertia vary directly with $g_{U}$, the gravitational redshift vary inversely with $g_{U}$ approximately.
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