GUT-scale primordial black holes: Mergers and gravitational waves

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dc.contributor.author Zagorac, JL en
dc.contributor.author Easther, Richard en
dc.contributor.author Padmanabhan, N en
dc.date.accessioned 2019-10-08T09:35:13Z en
dc.date.issued 2019-06 en
dc.identifier.citation Journal of Cosmology and Astroparticle Physics 18 pages Article number 052 Jun 2019 en
dc.identifier.issn 1475-7516 en
dc.identifier.uri http://hdl.handle.net/2292/48522 en
dc.description.abstract Tight constraints on the abundance of primordial black holes can be deduced across a vast range of masses, with the exception of those light enough to fully evaporate before nucleosynthesis. This hypothetical population is almost entirely unconstrained, to the point where the early Universe could pass through a matter-dominated phase with primordial black holes as the primary component. The only obvious relic of this phase would be Hawking radiated gravitons which would constitute a stochastic gravitational wave background in the present-day Universe, albeit at frequencies far beyond the scope of any planned detector technology. This paper explores the effects of classical mergers in such a matter dominated phase. For certain ranges of parameters, a significant fraction of the black holes merge, providing an additional, classical source of primordial gravitational waves. The resulting stochastic background typically has a lower amplitude than the Hawking background and lies at less extreme frequencies, but is unlikely to be easily detectable, with a maximal present day density of ΩGW ~ 10−12 and frequencies between 1015–1019 Hz. We also assess the impact of radiation accretion on the lifetimes of such primordial black holes and find that it increases the black hole mass by ~ 14% and the lifetimes by about 50%. However, this does not qualitatively change any of our conclusions. en
dc.language English en
dc.publisher IOP Publishing en
dc.relation.ispartofseries Journal of Cosmology and Astroparticle Physics en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.rights.uri http://ioppublishing.org/wp-content/uploads/2016/05/J-VAR-LF-0216-Author-Rights-New-5.pdf en
dc.subject Science & Technology en
dc.subject Physical Sciences en
dc.subject Astronomy & Astrophysics en
dc.subject Physics, Particles & Fields en
dc.subject Physics en
dc.subject gravitational waves / sources en
dc.subject gravitational waves / theory en
dc.subject primordial black holes en
dc.subject physics of the early universe en
dc.title GUT-scale primordial black holes: Mergers and gravitational waves en
dc.type Journal Article en
dc.identifier.doi 10.1088/1475-7516/2019/06/052 en
pubs.issue 6 en
dc.rights.holder Copyright: IOP Publishing en
pubs.author-url https://iopscience.iop.org/article/10.1088/1475-7516/2019/06/052 en
pubs.publication-status Published en
dc.rights.accessrights http://purl.org/eprint/accessRights/RestrictedAccess en
pubs.subtype Article en
pubs.elements-id 766314 en
pubs.org-id Science en
pubs.org-id Physics en
pubs.arxiv-id 1903.05053 en
pubs.number 052 en
pubs.record-created-at-source-date 2019-10-15 en
pubs.online-publication-date 2019-06-26 en


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