Varying primordial state fractions in exo- and endothermic SIDM simulations of Milky Way-mass haloes

Understand

Self-interacting dark matter (SIDM) is increasingly studied as a potential solution to small-scale discrepancies between simulations of cold dark matter (CDM) and observations.

• We examine a physically motivated two-state SIDM model with both elastic and inelastic scatterings.
• In particular, endothermic, exothermic, and elastic scattering occur with equal probability at high relative velocities ($v_{\rm rel}\gtrsim400~{\rm km/s})$.
• In a suite of cosmological zoom-in simulation of Milky Way-size haloes, we vary the primordial state fractions to understand the impact of inelastic dark matter self-interactions on halo structure and evolution.