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We study the dynamics and observational signatures of a neutron star beingconsumed by a much less massive black hole residing inside the star. Thisphenomenon could arise in a variety of scenarios, including after the captureof a primordial black hole, or in some models of asymmetric dark matter wherethe dark matter particles collect at the center of a neutron star andeventually collapse to form a black hole. However, the details of how theneutron star implodes are not well known, which is crucial to determining theobservational implications of such events. We utilize fully generalrelativistic simulations to follow the evolution of such a black hole as itgrows by several orders of magnitude, and ultimately consumes the neutron star.We consider a range of spin values for the neutron star, from non-rotatingstars, to those with millisecond periods, as well as different equations ofstate. We find that as the black hole grows, it obtains a non-negligible spinand induces differential rotation in the core of the neutron star. In contrastto previous studies, we find that the amount of dynamical ejecta is very small,even for rapidly rotating stars, dampening the prospects for producing akilonova-type electromagnetic signal from such events. We comment on otherpossible electromagnetic and gravitational signals.

Fate of a neutron star with an endoparasitic black hole and implications for dark matter