Effects of a Weakly Interacting Light U Boson on Protoneutron Stars Including the Hyperon-Hyperon Interactions |
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Authors: | Zi Yu Yan Xu Gui-Qing Zhang Tao-Ping Hu |
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Affiliation: | 1. College of Science, Nanjing Forestry University, Nanjing 210037, China;2. Changchun Observatory, National Astronomical Observatories, Chinese Academy of Sciences, Changchun 130117, China;3. Department of Physics, Tianjin University of Science and Technology, Tianjin 300457, China |
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Abstract: | 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 g2/μ2 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 g2/μ2 in an approximate linear trend. The possible way to constrain the coupling constants of the U-boson is discussed. |
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Keywords: | neutron star U-boson hyperon-hyperon interactions |
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