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• W3206328870 abstract "We consider spherically symmetric accretion onto a small, possibly primordial, black hole residing at the center of a neutron star governed by a realistic cold nuclear equation of state (EOS). We generalize the relativistic Bondi solution for such EOSs, approximated by piecewise polytropes, and thereby obtain analytical expressions for the steady-state matter profiles and accretion rates. We compare these rates with those found by time-dependent, general relativistic hydrodynamical simulations upon relaxation and find excellent agreement. We consider several different candidate EOSs, neutron star masses and central densities and find that the accretion rates vary only little, resulting in an accretion rate that depends primarily on the black hole mass, and only weakly on the properties of the neutron star. However, we also find that several of the resulting fluid profiles feature superluminal sound speeds outside black hole horizons, indicating that either the corresponding EOSs, or their piecewise polytrope representations, are no longer adequate for the supranuclear densities encountered in these flows." @default.
• W3206328870 created "2021-10-25" @default.
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• W3206328870 date "2021-10-15" @default.
• W3206328870 modified "2023-09-27" @default.
• W3206328870 title "Accretion onto black holes inside neutron stars with realistic nuclear equations of state: analytic and numerical treatments" @default.
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