Seven hints for primordial black hole dark matter

By S. Clesse, Juan García-Bellido. Physics of the Dark Universe, 2017

207 citations recorded by the source corpus.

Seven observations point towards the existence of primordial black holes (PBH), constituting the whole or an important fraction of the dark matter in the Universe: the mass and spin of black holes detected by Advanced LIGO/VIRGO, the detection of micro-lensing events of distant quasars and stars in M31, the non-detection of ultra-faint dwarf satellite galaxies with radius below 15 parsecs, evidences for core galactic dark matter profiles, the correlation between X-ray and infrared cosmic backgrounds, and the existence of super-massive black holes very early in the Universe's history. Some of these hints are newly identified and they are all intriguingly compatible with the re-constructed broad PBH mass distribution from LIGO events, peaking on PBH mass $m_{\rm PBH} \approx 3 M_\odot$ and passing all other constraints on PBH abundances. PBH dark matter also provides a new mechanism to explain the mass-to-light ratios of dwarf galaxies, including the recent detection of a diffuse galaxy not dominated by dark matter. Finally we conjecture that between 0.1% and 1% of the events detected by LIGO will involve a PBH with a mass below the Chandrasekhar mass, which would unambiguously prove the existence of PBH.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/0dfae282351e29b2d6c65818239e264ed6040f91

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Citations in the corpus

Primordial black holes as dark matter candidates (2021, background): “The first three are associated with microlensing (ML): (1) ML events towards the Galactic bulge generated by planetary-mass objects [124]; (2) ML of quasars [198], including ones where the probability of lensing by a star is very low; (3) the unexpectedly high number of ML events towards the Galacti”
Gravitational waves from a universe filled with primordial black holes (2020, unknown): “[11] .”
Primordial Black Holes as Dark Matter: Recent Developments (2020, background): “The next three are associated with accretion and dynamical effects: (4) unexplained correlations in the source-subtracted X-ray and cosmic infrared background fluctuations [247]; (5) the non-observation of ultra-faint dwarf galaxies (UFDGs) below the critical radius associated with dynamical disrupt”
Steepest growth of the power spectrum and primordial black holes (2018, unknown): “1 This is motivated by the fact that there are several hints for the existence of PBHs [8], for example the progenitor BH spins of the LIGO detections being consistent with zero in most cases [9–12], which is expected for PBHs formed during radiation domination [13] (but not matter domination [14]) ”
A Brief Review on Primordial Black Holes as Dark Matter (2021, background): “Analysis of posterior data from the gravitational wave detectors LIGO and Virgo showed that the detected mergers are compatible with the hypothesis of their components being of primordial nature, although there is no strong preference over stellar BHs (Sasaki et al., 2016; Ali-Haïmoud et al., 2017; ”
The exponential tail of inflationary fluctuations: consequences for primordial black holes (2019, background): “[23] for hints in favour of the existence of PBHs).”