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(Just can’t get enough) primordial black holes

13 Feb 2018, 11:16 UTC
(Just can’t get enough) primordial black holes
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Title: Inflationary Primordial Black Holes as All Dark MatterAuthors: Keisuke Inomata, Masahiro Kawasaki, Kyohei Mukaida, Yuichiro Tada and Tsutomu T. YanagidaFirst Author’s Institution: ICRR, University of Tokyo, Japan, and Kavli IPMU (WPI), UTIAS, University of Tokyo, JapanStatus: Published in Phys. Rev. D 96, 123527 (2017)The recent gravitational wave detections by LIGO/VIRGO of black hole mergers have brought primordial black holes (PBHs) right back into the fray as a potential candidate for dark matter. This is because the black holes detected by LIGO that were a few dozen times the mass of the Sun could well have been PBHs.However, even more intriguingly, there is another window of opportunity for primordial black holes with much lower masses to make up all of dark matter. In today’s paper, Inomata et al. show that it’s possible to produce enough PBHs with masses of around (the mass of the asteroid Ida) to make them a viable dark matter candidate, without violating the new and very stringent constraints on the number of allowed PBHs from the Subaru Hyper Suprime-Cam (see the results here).What is a primordial black hole?Primordial black holes are thought to have formed in the very early universe, typically within the first second of ...

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