Department of Physics and Astronomy

University of Mississippi

Events

Event Information:

  • Tue
    12
    Apr
    2016

    Colloquium

    4:00 pmLewis Hall 101

    Greg Dooley
    Kavli Institute for Astrophysics and Space Research
    Massachusetts Institute of Technology

    Tidal Stripping with Self-Interacting Dark Matter

    Self-interacting dark matter (SIDM) postulates that dark matter is not entirely collisionless, but self scatters at a low rate. By transforming dark matter halo cusps to cores, SIDM offers a solution to the “too big to fail” problem and cusp/core problem in the Milky Way and local field. Two classes of models exist, with velocity-independent and velocity-dependent cross sections. While tight constraints exist on velocity-independent models, constraining velocity-dependent models remain elusive. In this talk, I discuss the implications of both types of SIDM on the tidal disruption of satellite galaxies in a Milky Way-like host. While the total dark matter mass loss rate is not affected, stellar mass loss is enhanced due to lower binding energy in subhalo cores. I discuss the variables affecting the strength of the increased stellar mass loss rate, the effect on observables in the Milky Way, and where we need to look to further constrain or identify self-interacting dark matter.