EPT Seminar

Date
Mon, Nov 19, 2018 3:00 pm - 4:30 pm
Location
PSC 3150

Description

Title: Cooling self-interacting dark matter halos

Speaker: Yiming Zhong, Boston University

Abstract: Dark sector models naturally introduce elastic and dissipative self-interactions of dark matter. If such interactions exist, the induced heat flow permits the gravothermal evolution of the halo: the inner halo firstly develops a core but ultimately becomes cuspy. Based on a semi-analytical fluid model calibrated with N-body simulations, we find that a mild dissipative scattering can significantly accelerate the gravothermal evolution. Using near-field dwarf galaxies that exhibit a core-like dark matter density profile, we derive novel constraints on the dissipative self-interactions.