摘要
In the framework of the relativistic mean field theory including the hyperon-hyperon(YY) interactions,protoneutron stars with a weakly interacting light U boson are studied. The U-boson leads to the increase of the star maximum mass. The modification to the maximum mass by the U-boson with the strong YY interaction is larger than that with the weak YY interaction. The maximum mass of the protoneutron star is less sensitive to the U-boson than that of the neutron star. The inclusion of the U-boson narrows down the mass window for the hyperonized protoneutron stars. As g^2/μ~2 increases, the species of hyperons, which can appear in a stable protoneutron star decrease. The rotation frequency, the red shift, the momentum of inertia and the total neutrino fraction of PSR J1903-0327 are sensitive to the U-boson and change with g^2/μ~2 in an approximate linear trend. The possible way to constrain the coupling constants of the U-boson is discussed.
作者
Zi Yu
Yan Xu
Gui-Qing Zhang
Tao-Ping Hu
喻孜;许妍;张贵清;胡涛平(College of Science, Nanjing Forestry University, Nanjing 210037, China;Changchun Observatory, National Astronomical Observatories, Chinese Academy of Sciences, Changchun 130117, China;Department of Physics, Tianjin University of Science and Technology, Tianjin 300457, China)
基金
Supported by Jiangsu Province Natural Science Foundation Youth Fund of China under Grant No.Bk20140982
National Natural Science Foundation of China under Grant No.11447165
Youth Innovation Promotion Association,Chinese Academy of Sciences under Grant No.2016056
the Development Project of Science and Technology of Jilin Province under Grant No.20180520077JH