July 29, 2019 to August 2, 2019
Northeastern University
US/Eastern timezone

Constraining Dissipative Dark Matter Self-Interactions

Jul 30, 2019, 2:51 PM
17m
West Village G 102 (Northeastern University)

West Village G 102

Northeastern University

Oral Presentation Dark Matter Dark Matter

Speaker

Yiming Zhong (Stony Brook University)

Description

Dark sector models with light or massless mediators naturally introduce elastic and dissipative self-interactions of dark matter. The heat exchange induced by the elastic scattering permits the gravothermal evolution of the halo. Through the evolution, a halo with a cuspy inner density profile develops a core first but become cuspy again at late time. We find that a mild dissipative scattering can significantly accelerate this evolution process. Constraints on the dissipative scattering cross section and the dissipated energy per collision can be inferred from the density cores of dwarf galaxies with low baryonic contents.

Primary author

Yiming Zhong (Stony Brook University)

Co-authors

Samuel McDermott Hai-Bo Yu (University of California, Riverside) Rouven Essig

Presentation materials