Physics at Virginia

"Constraints on interacting dark matter from small scale structure"

Lan Nguyen , Notre Dame
[Host: Bob Hirosky]

In this talk we study the effects of interacting dark matter in the structure of galactic halos. The core-cusp problem remains as one of the unresolved challenges between observation and simulations in the standard CDM model for the formation of galaxies. Basically, the problem is that CDM simulations predict that the center of galactic dark matter halos contain a steep power-law mass density profile. However, observations of dwarf galaxies in the Local Group reveal a density profile consistent with a nearly at distribution of dark matter near the center. A number of solutions to this dilemma have been proposed. We discuss the possibility that the dark matter particles themselves self interact and scatter. The scattering of dark matter particles then can smooth out their profile in high-density regions. We also summarize a theoretical model as to how self- interacting dark matter may arise. We implement this form in simulations of self-interacting dark matter in models for galaxy formation and evolution. Constraints on properties of this form of self-interacting dark matter will be summarized.

High Energy Physics Seminar
Wednesday, November 1, 2017
3:30 PM
Physics Building, Room 204
Note special room.

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