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Effects of critical collapse on primordial black-hole mass spectra
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).
Stockholms universitet, Nordiska institutet för teoretisk fysik (Nordita).
Rekke forfattare: 32016 (engelsk)Inngår i: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 76, nr 2, artikkel-id 93Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Certain inflationary models as well as realisations of phase transitions in the early Universe predict the formation of primordial black holes. For most mass ranges, the fraction of matter in the form of primordial black holes is limited by many different observations on various scales. Primordial black holes are assumed to be formed when overdensities that cross the horizon have Schwarzschild radii larger than the horizon. Traditionally it was therefore assumed that primordial black-holemasses were equal to the horizon mass at their time of formation. However, detailed calculations of their collapse show that primordial black holes formed at each point in time should rather form a spectrum of different masses, obeying critical scaling. Though this has been known for more than 15 years, the effect of this scaling behaviour is largely ignored when considering predictions for primordial black-hole mass spectra. In this paper we consider the critical collapse scaling for a variety of models which produce primordial black holes, and find that it generally leads to a shift, broadening and an overall decrease of the mass contained in primordial black holes. This effect is model and parameter dependent and cannot be contained by a constant rescaling of the spectrum; it can become important and should be taken into account when comparing to observational constraints.

sted, utgiver, år, opplag, sider
2016. Vol. 76, nr 2, artikkel-id 93
HSV kategori
Identifikatorer
URN: urn:nbn:se:su:diva-128544DOI: 10.1140/epjc/s10052-016-3945-8ISI: 000371431500002OAI: oai:DiVA.org:su-128544DiVA, id: diva2:940054
Tilgjengelig fra: 2016-06-20 Laget: 2016-03-30 Sist oppdatert: 2017-11-28bibliografisk kontrollert

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