Accelerated core collapse in tidally stripped self-interacting dark matter halos

Understand

We use a semianalytic approach that is calibrated to N-body simulations to study the evolution of self-interacting dark matter cores in galaxies.

• We demarcate the regime where the temporal evolution of the core density follows a well-defined track set by the initial halo parameters and the cross section.
• Along this track, the central density reaches a minimum value set by the initial halo density.
• Further evolution leads to an outward heat transfer, inducing gravothermal core collapse such that the core shrinks as its density increases.