Primordial black holes survive SN lensing constraints
EntityUAM. Departamento de Física Teórica; Instituto de Física Teórica (IFT)
10.1016/j.dark.2018.04.005Physics of the Dark Universe 20 (2018): 95-100
Funded byJGB thanks the CERN TH-Division for hospitality during his sabbatical, and acknowledges support from the Research Project FPA2015-68048-03-3P [MINECO-FEDER] and the Centro de Excelencia Severo Ochoa Program SEV- 2016-0597. He also acknowledges support from the Salvador de Madariaga Program, Ref. PRX17/00056. The work of SC is supported by a Charg e de Recherche grant of the Belgian Fund for Research FRS/FNRS. PF acknowledges support by the Swiss National Science Foundation
ProjectGobierno de España. FPA2015-68048-03-3P; Gobierno de España. SEV-2016-0597
SubjectsDark matter; Gravitational lensing; Primordial black holes; Física
Rights© 2018 Elsevier B.V.
Esta obra está bajo una licencia de Creative Commons Reconocimiento-NoComercial-SinObraDerivada 4.0 Internacional.
It has been claimed in [arxiv:1712.02240] that massive primordial black holes (PBH) cannot constitute all of the dark matter (DM), because their gravitational-lensing imprint on the Hubble diagram of type Ia supernovae (SN) would be incompatible with present observations. In this note, we critically review those constraints and find several caveats on the analysis. First of all, the constraints on the fraction α of PBH in matter seem to be driven by a very restrictive choice of priors on the cosmological parameters. In particular, the degeneracy between Ωmand α was ignored and thus, by fixing Ωm, transferred the constraining power of SN magnitudes to α. Furthermore, by considering more realistic physical sizes for the type-Ia supernovae, we find an effect on the SN lensing magnification distribution that leads to significantly looser constraints. Moreover, considering a wide mass spectrum of PBH, such as a lognormal distribution, further softens the constraints from SN lensing. Finally, we find that the fraction of PBH that could constitute DM today is bounded by fPBH<1.09(1.38), for JLA (Union 2.1) catalogs, and thus it is perfectly compatible with an all-PBH dark matter scenario in the LIGO band
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