Maya Silverman looks at SIDM core collapse in cosmological DM simulations: halos with frequent massive mergers inject heat and prevent core collapse #KICPDM Silverman: SIDM can change stellar stream properties on average: doesn't affect the earliest disruption, but by the end about 80% of SIDM vs 55% of CDM dwarf galaxies are completely disrupted #KICPDM Vedant Chandra: the Via project will get 0.1 km/s stable velocity precision for streams. If v precision of only 1 km/s, can only see a few very large impacts; but 0.1 km/s resolves 20-30x more impacts reaching to 1e8 Msun halos at infall #KICPDM