The Minimum Mass of Compact Objects from Dissipative Dark Matter

James Gurian, Michael Ryan, Sarah Schon, Donghui Jeong, Sarah Shandera

Submitted on 31 August 2022


We study the minimum mass of dark compact objects formed in dissipative dark-matter halos and show that the simple atomic-dark-matter model consistent with all current observations can create low-mass fragments that can evolve into compact objects forbidden by stellar astrophysics. We model the collapse of the dark halo's dense core by tracing the thermo-chemical evolution of a uniform-density volume element under two extreme assumptions for density evolution: hydrostatic equilibrium and pressure-free collapse. We then compute the opacity-limited minimum fragment mass from the minimum temperature achieved in these calculations.


Comment: 6 pages, 3 figures

Subject: Astrophysics - Cosmology and Nongalactic Astrophysics