scholarly journals Searching for dark matter constituents with many solar masses

2016 ◽  
Vol 31 (16) ◽  
pp. 1650093 ◽  
Author(s):  
Paul H. Frampton
Keyword(s):  
Black Holes ◽  
Dark Matter ◽  
Cosmic Microwave Background ◽  
Massive Particle ◽  
Search Strategies ◽  
Observational Constraints ◽  
Primordial Black Holes ◽  
Microwave Background ◽  
Weak Scale ◽  
Weakly Interacting

Searches for dark matter (DM) constituents are presently mainly focused on axions and weakly interacting massive particle (WIMPs) despite the fact that far higher mass constituents are viable. We discuss and dispute whether axions exist and those arguments for WIMPs which arise from weak scale supersymmetry. We focus on the highest possible masses and argue that, since if they constitute all DM, they cannot be baryonic, they must uniquely be primordial black holes. Observational constraints require them to be of intermediate masses mostly between ten and a hundred thousand solar masses. Known search strategies for such PIMBHs include wide binaries, cosmic microwave background (CMB) distortion and, most promisingly, extended microlensing experiments.

scholarly journals Primordial Black Holes and a Common Origin of Baryons and Dark Matter

Universe ◽  
2021 ◽  
Vol 8 (1) ◽  
pp. 12
Author(s):  
Juan García-Bellido ◽  
Bernard Carr ◽  
Sébastien Clesse
Keyword(s):  
Black Holes ◽  
Dark Matter ◽  
Gluon Plasma ◽  
Baryon Asymmetry ◽  
Observational Constraints ◽  
Primordial Black Holes ◽  
Distribution Ranges ◽  
Subsequent Propagation ◽  
Rare Regions ◽  
The Universe

The origin of the baryon asymmetry of the Universe (BAU) and the nature of dark matter are two of the most challenging problems in cosmology. We propose a scenario in which the gravitational collapse of large inhomogeneities at the quark-hadron epoch generates both the baryon asymmetry and most of the dark matter in the form of primordial black holes (PBHs). This is due to the sudden drop in radiation pressure during the transition from a quark-gluon plasma to non-relativistic hadrons. The collapse to a PBH is induced by fluctuations of a light spectator scalar field in rare regions and is accompanied by the violent expulsion of surrounding material, which might be regarded as a sort of “primordial supernova". The acceleration of protons to relativistic speeds provides the ingredients for efficient baryogenesis around the collapsing regions and its subsequent propagation to the rest of the Universe. This scenario naturally explains why the observed BAU is of order the PBH collapse fraction and why the baryons and dark matter have comparable densities. The predicted PBH mass distribution ranges from subsolar to several hundred solar masses. This is compatible with current observational constraints and could explain the rate, mass and low spin of the black hole mergers detected by LIGO-Virgo. Future observations will soon be able to test this scenario.

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