A two-fluid Tolman-Oppenheimer-Volkoff calculation with Einasto dark matter halos produces static solutions where g_rr^{-1} turns negative in a shell outside the neutron star, which the authors call a neutron star inside a black hole.
Frozen Neutron Stars
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abstract
We investigate neutron stars with nonlinear magnetic monopoles in the framework of the Einstein-nonlinear electrodynamics model, specifically within the Bardeen and Hayward models. Solving the modified Tolman-Oppenheimer-Volkoff equations for three different equations of state, we find that upon reaching the critical magnetic charge $q_{c}$, neutron stars enter frozen states characterized by the critical horizon. This extends the concept of frozen states to compact objects composed of ordinary matter (non-field matter), thereby offering a new perspective for related research.
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A Neutron Star Hidden Inside a Black Hole
A two-fluid Tolman-Oppenheimer-Volkoff calculation with Einasto dark matter halos produces static solutions where g_rr^{-1} turns negative in a shell outside the neutron star, which the authors call a neutron star inside a black hole.