Northwestern Events Calendar

Feb
27
2017

James Unwin: Cores in Dwarf Galaxies from Fermi Repulsion

When: Monday, February 27, 2017
4:00 PM - 5:00 PM CT

Where: Technological Institute, F160, 2145 Sheridan Road, Evanston, IL 60208 map it

Audience: Faculty/Staff - Student - Public - Post Docs/Docs - Graduate Students

Contact: Pamela Villalovoz   (847) 491-3644

Group: Physics and Astronomy High Energy Physics Seminars

Category: Academic

Description:

Title: Cores in Dwarf Galaxies from Fermi Repulsion

Speaker: James Unwin, UIC
 

Abstract: Cold dark matter provides a remarkably good description of cosmology and astrophysics. However, observations connected with small scales might be in tension with this framework. In particular, structure formation simulations suggest that the density profiles of dwarf spheroidal galaxies should exhibit cusps, in contrast to observations. I will show that Fermi repulsion can explain the observed cored density profiles in dwarf galaxies for sub-keV fermionic dark matter. While in conventional dark matter scenarios, such sub-keV thermal dark matter would be excluded by free streaming bounds, I will argue that these constraints are ameliorated in models with dark matter at lower temperature than conventional thermal scenarios and discuss aspects of model building.

 

 

Keywords: Physics, Astronomy, HEP

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