Physics (Internal)

Gravothermal evolution of galactic dark matter halos with velocity-dependent self-interactions

This event is part of the HET Seminar Series.

The evolution of galactic dark matter halos would be modified if dark matter were self-interacting. The early heat conduction from the halo envelope to the core would enlarge the core size and reduce the central cusps. The late heat conduction from the core to the envelope would collapse the core into a singular state. Previous studies have focused on constraining the velocity independent self-interaction from the gravothermal evolution of the dark matter halo. In this talk, we investigate the velocity dependent scenario, which is well-motivated from low-mass dark sector models, and find the preferred and excluded interaction strengths based on two physical scenarios.