:::info Authors:
(1) Antonio Riotto, Département de Physique Theorique, Universite de Geneve, 24 quai Ansermet, CH-1211 Geneve 4, Switzerland and Gravitational Wave Science Center (GWSC), Universite de Geneve, CH-1211 Geneva, Switzerland;
(2) Joe Silk, Institut d’Astrophysique, UMR 7095 CNRS, Sorbonne Universite, 98bis Bd Arago, 75014 Paris, France, Department of Physics and Astronomy, The Johns Hopkins University, Baltimore MD 21218, USA, and Beecroft Institute of Particle Astrophysics and Cosmology, Department of Physics, University of Oxford, Oxford OX1 3RH, UK.
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Table of Links2.1 What is the abundance of PBHs?
2.2 What is the effect of PBH clustering?
2.3 What fraction of the currently observed GW events can be ascribed to PBHs?
3.3 Plugging the pair instability gap with PBH?
3.4 PBH eccentricity, 3.5 PBH spin and 3.6 Future gamma-ray telescopes
4 ConclusionsSupport for the existence of PBHs hypothesis comes from a range of arguments spanning dark matter physics, inflationary models, astrophysics, gravitational microlensing and quantum cosmology. None are yet conclusive but the cumulative support for the existence of PBHs seems reasonably compelling. More to the point however is that there is a rich astrophysical agenda of open questions that contribute to a future road map for a plethora of research projects.
\ Two of the most fundamental PBH probes that distinguish them from astrophysical counterparts are their redshift and mass distributions. This combination provides an armoury of smoking guns that will inevitably enrich the next generation of gravitational wave and gravitational microlensing experiments. Confirmation will require improved statistics as single events may not be conclusive. it is only too easy to come up with rare events that can masquerade as PBH candidates, for example by appealing to higher order generations of merging events or to non-Gaussianity. We have laid out a possible future road map for definitively assessing whether PBHs can present a viable candidate for dark matter, or possibly contribute to other astrophysical or even quantum cosmology anomalies.
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