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Department of Physics and Astronomy
University of Mississippi


Event Information:

  • Tue

    Colloquium: Self Interacting Dark Matter and the Small-Scale Structure Problem

    4:00 pmZoom Meeting. See Below.

    Lan Quynh Nguyen
    Department of Physics
    University of Notre Dame

    Self Interacting Dark Matter and the Small-Scale Structure Problem

    The core-cusp problem remains as a challenging discrepancy between observations and simulations in the standard CDM model for the formation of galaxies. The problem is that CDM simulations predict a steep power-law mass density profile at the center of galactic dark matter halos. However, observations of dwarf galaxies in the Local Group reveal a density profile consistent with a nearly flat distribution of dark matter near the center. A number of solutions to this dilemma have been proposed. Here, we summarize investigations into the possibility that the dark matter particles themselves self-interact and scatter. Such self-interacting dark matter (SIDM) particles can smooth out the dark-matter profile in high-density regions. We also review the theoretical proposal that self-interacting dark matter may arise as an additional Higgs scalar in the 3-3-1 extension of the standard model. We present new simulations of galaxy formation and evolution for this formulation of self-interacting dark matter. Current constraints on this self-interacting dark matter are then summarized.



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    Meeting ID: 919 282 27187