Dark Black Holes in the Mass Gap
arXiv:2208.08557 · doi:10.1088/1475-7516/2024/01/064
Abstract
In the standard picture of stellar evolution, pair-instability -- the energy loss in stellar cores due to electron-positron pair production -- is predicted to prevent the collapse of massive stars into black holes with mass in the range between approximately 50 and 130 solar masses -- a range known as the "{\em black hole mass gap}". LIGO detection of black hole binary mergers containing one or both black holes with masses in this {\em mass gap} thus challenges the standard picture, possibly pointing to an unexpected merger history, unanticipated or poorly understood astrophysical mechanisms, or new physics. Here, we entertain the possibility that a "dark sector" exists, consisting of dark electrons, dark protons, and electromagnetic-like interactions, but no nuclear forces. Dark stars would inevitably form given such dark sector constituents, possibly collapsing into black holes with masses within the mass gap. We study in detail the cooling processes necessary for successful stellar collapse in the dark sector and show that for suitable choices of the particle masses, we indeed predict populating the mass gap with dark sector black holes. In particular, we numerically find that the heavier of the two dark sector massive particles cannot be lighter than, approximately, the visible sector proton for the resulting dark sector black holes to have masses within the mass gap. We discuss constraints on this scenario and how to test it with future, larger black hole merger statistics.
25 pages, 6 figures, Comments Welcome, added citations in v2
References in corpus (14)
- Advanced Virgo: a 2nd generation interferometric gravitational wave detector
- Advanced LIGO
- Pulsational Pair-Instability Supernovae
- Properties and astrophysical implications of the 150 Msun binary black hole merger GW190521
- Merging black holes in young star clusters
- Polluting the pair-instability mass gap for binary black holes through super-Eddington accretion in isolated binaries
- OGLE-III Microlensing Events and the Structure of the Galactic Bulge
- Dark Matter as a Trigger for Periodic Comet Impacts
- Structure Formation and Exotic Compact Objects in a Dissipative Dark Sector
- Generation of massive stellar black holes by rapid gas accretion in primordial dense clusters
- Cooling in a Dissipative Dark Sector
- A Lower Bound on the Mass of Compact Objects from Dissipative Dark Matter
- Astrophysical probes of inelastic dark matter with a light mediator
- Constraining Dark Matter Inside Stars Using Spectroscopic Binaries and a Modified Mass-Luminosity Relation