Electromagnetic probes of primordial black holes as dark matter

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https://baas.aas.org/pub/2020n3i051/release/1

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UMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)
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https://orcid.org/0000-0001-8403-8548

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2019-05-31

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journal articles
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Kashlinsky, A., Ali-Haïmoud, Y., Clesse, S., Garcia-Bellido, J., Amendola, L., Wyrzykowski, L., … Young, S. (2019). Electromagnetic probes of primordial black holes as dark matter. Bulletin of the AAS, 51(3). Retrieved from https://baas.aas.org/pub/2020n3i051

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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract

The LIGO discoveries have rekindled suggestions that primordial black holes (BHs) may constitute part to all of the dark matter (DM) in the Universe. Such suggestions came from 1) the observed merger rate of the BHs, 2) their unusual masses, 3) their low/zero spins, and 4) also from the independently uncovered cosmic infrared background (CIB) fluctuations signal of high amplitude and coherence with unresolved cosmic X-ray background (CXB). Here we sum marize the prospects to resolve this important issue with electromagnetic observations using the instruments and tools expected in the 2020’s. These prospects appear promising to make signif icant, and potentially critical, advances. We demonstrate that in the next decade, new space and ground-borne electromagnetic instruments, combined with concurrent theoretical ef forts, should shed critical light on the long-considered link between primordial BHs and DM. Specifically the new data and methodologies under this program will involve: • Probing with high precision the spatial spectrum of source-subtracted CIB with Euclid and WFIRST, and its coherence with unresolved cosmic X-ray background using eROSITA and Athena, • Advanced searches for microlensing of Galactic stars by the intervening Galactic Halo BHs with OGLE, Gaia, LSST and WFIRST, • Supernovae (SNe) lensing in the upcoming surveys with WFIRST, LSST and also potentially with Euclid and JWST, • Advanced theoretical work to understand the details of PBH accretion and evolution and their influence on cosmic microwave background (CMB) anisotropies in light of the next generation CMB experiments, • Better new samples and theoretical understanding involving stability and properties of ultra faint dwarf galaxies, pulsar timing, and cosmological quasar lensing.