Structure and stability of warm cores in neutron stars

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Neutron Stars, Stellar Mass Ejection, Stellar Structure, Stellar Temperature, Degenerate Matter, Equations Of State, Gibbs Free Energy, Isothermal Processes, Moments Of Inertia, Red Shift, Stellar Gravitation

Scientific paper

Using Lamb's (1969) equations of state for warm neutron degenerate matter, relativistic equations of structure are solved. The stability of isothermal cores in neutron stars is discussed, and the possible compatibility of the results obtained with experimental evidence is shown. Here, the leptonic pressure is derived from the standard Fermi-Dirac statistics, and the chemical potential of nucleons is obtained by following the perturbation approach employed by Langer et al. (1969, 1970) and then by splitting each nucleon Gibbs energy into a free-particle Gibbs energy and and interaction energy. The nucleon-nucleon interaction is described through the velocity-dependent potential of Weiss and Cameron (1969).

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