| Article | |
| Report number | CERN-TH-2017-271 ; IFT-UAM-CSIC-17-123 ; arXiv:1712.06574 |
| Title | LIGO Lo(g)Normal MACHO: Primordial Black Holes survive SN lensing constraints |
| Related title | LIGO Lo(g)Normal MACHO: Primordial Black Holes survive SN lensing constraints |
| Author(s) | Garcia-Bellido, Juan (Madrid, IFT ; CERN) ; Clesse, Sebastien (Louvain U., CP3 ; Namur U.) ; Fleury, Pierre (Geneva U., Dept. Theor. Phys.) |
| Publication | 2018-06 |
| Imprint | 2017-12-18 |
| Number of pages | 6 |
| Note | 7 pages, 7 figures |
| In: | Phys. Dark Univ. 20 (2018) 95-100 |
| DOI | 10.1016/j.dark.2018.04.005 |
| Subject category | hep-ph ; Particle Physics - Phenomenology ; gr-qc ; General Relativity and Cosmology ; astro-ph.GA ; Astrophysics and Astronomy ; astro-ph.CO ; Astrophysics and Astronomy |
| Abstract | It has been claimed in Ref.[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 paper, we critically review those constraints and find several caveats on the analysis. First of all, the constraints on the fraction $\alpha$ of PBH in matter seem to be driven by a very restrictive choice of priors on the cosmological parameters. In particular, the degeneracy between $\Omega_{\rm M}$ and $\alpha$ is ignored and thus, by fixing $\Omega_{\rm M}$, transferred the constraining power of SN magnitudes to $\alpha$. 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 $f_{\rm PBH} < 1.09\ (1.38)$, for JLA (Union 2.1) catalogs, and thus it is perfectly compatible with an all-PBH dark matter scenario in the LIGO band. |
| Copyright/License | © 2018 Published by Elsevier B.V. (License: arXiv nonexclusive-distrib. 1.0) |
Corresponding record in: Inspire
Záznam vytvorený 2017-12-20, zmenený 2021-05-03
