• Xian-Feng Zhao

      Articles written in Journal of Astrophysics and Astronomy

    • The Potential Well-Depth $U^{(N)}_{\Sigma}$ Constraints on the Surface Gravitational Red-shift of a Proto Neutron Star

      Xian-Feng Zhao

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      The influence of the potential well depth $U^{(N)}_{\Sigma}$ of 𝛴 in nuclear matter on the surface gravitational red-shift of a proto neutron star is examined within the framework of the relativistic mean field theory for the baryon octet system. It is found that as $U^{(N)}_{\Sigma}$ increases from -35 MeV to +35 MeV, the surface gravitational red-shift increases and the influence of the negative $U^{(N)}_{\Sigma}$ on the surface gravitational red-shift is larger than that of the positive ones. Furthermore, the 𝑀max/𝑅 and the surface gravitational red-shift corresponding to the maximum mass all increase as the $U^{(N)}_{\Sigma}$ increases, 𝑀max and 𝑅 being the maximum mass of the proto neutron star and the corresponding radius respectively.

    • Constraints on the Moment of Inertia of a Proto Neutron Star from the Hyperon Coupling Constants

      Xian-Feng Zhao Huan-Yu Jia

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      The influence of the hyperon coupling constants on the moment of inertia of a proto neutron star has been investigated within the framework of relativistic mean field theory for the baryon octet {𝑛, 𝑝, 𝛬, 𝛴-, 𝛴0, 𝛴+, Ξ-, Ξ0} system. It is found that for a proto neutron star, the mass, the moment of inertia and their own maximum values as a function of radius 𝑅 or 𝑀/𝑅 are all more sensitive to the hyperon coupling constants. For all the different hyperon coupling constants mentioned, the case of no hyperons corresponds to the largest moment of inertia.

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