A Lower Bound on the Mass of Compact Objects from Dissipative Dark Matter

Abstract

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.

6 pages, 3 figures. Updated figures to reflect a corrected H2 dissociation rate in DarkKROME

References in corpus (5)

• Dark Matter and Dark Radiation
• Uncertainties in H2 and HD Chemistry and Cooling and their Role in Early Structure Formation
• Hidden Sector Hydrogen as Dark Matter: Small-scale Structure Formation Predictions and the Importance of Hyperfine Interactions
• Structure Formation and Exotic Compact Objects in a Dissipative Dark Sector
• Massive Black Holes from Dissipative Dark Matter

Cited by in corpus (10)

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• Dissipative Dark Cosmology: From Early Matter Dominance to Delayed Compact Objects
• Baryogenesis through Asymmetric Reheating in the Mirror Twin Higgs
• The Effect of Multiple Cooling Channels on the Formation of Dark Compact Objects
• Effects of $f(R,G)$ gravity on anisotropic charged compact objects
• Cool dark sector, concordance, and a low ${\sigma }_8$
• Zero Metallicity with Zero CPU Hours: Masses of the First Stars on the Laptop
• Dimming Starlight with Dark Compact Objects