2014/05/31 by Kazunori Kohri, Tomohiro Nakama, Teruaki Suyama · 142 citations
Physics and Astronomy · #Astrophysics #Binary black hole #Cosmic microwave background #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark matter #Distortion (music) #Galaxies: Formation, Evolution, Phenomena #Galaxy #Gravitational wave #Physics #Primordial black hole #Supermassive black hole #Universe #astro-ph.CO #astro-ph.HE #gr-qc #hep-ph
paper · pdf · doi:10.1103/physrevd.90.083514
published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 90(8) (American Physical Society) · 29 pages, 8 figures, Replacement to match published version
openalex publication_date 2014/10/14 · arxiv created 2014/10/16 · arxiv updated 2014/10/17 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Supermassive black holes and intermediate mass black holes are believed to exist in the Universe. There is no established astrophysical explanation for their origin, and considerations have been made in the literature that those massive black holes (MBHs) may be primordial black holes (PBHs), black holes which are formed in the early universe (well before the matter-radiation equality) due to the direct collapse of primordial overdensities. This paper aims at discussing the possibility of excluding the PBH scenario as the origin of the MBHs. We first revisit the constraints on PBHs obtained from the cosmic microwave background (CMB) distortion that the seed density perturbation causes. By adopting a recent computation of the CMB distortion sourced by the seed density perturbation and the stronger constraint on the CMB distortion set by the COBE/FIRAS experiment used in the literature, we find that PBHs in the mass range 6\ifmmode×\else\texttimes\fi104 M_\ensuremath\bigodot\text\ensuremath-5\ifmmode×\else\texttimes\fi1013 M_\ensuremath\bigodot are excluded. Since PBHs lighter than 6\ifmmode×\else\texttimes\fi104 M_\ensuremath\bigodot are not excluded from the nonobservation of the CMB distortion, we propose a new method which can potentially exclude smaller PBHs as well. Based on the observation that large density perturbations required to create PBHs also result in the copious production of ultracompact minihalos (UCMHs), compact dark matter halos formed at around the recombination, we show that weakly interacting massive particles (WIMPs) as dark matter annihilate efficiently inside UCMHs to yield cosmic rays far exceeding the observed flux. Our bound gives severe restriction on the compatibility between the particle physics models for WIMPs and the PBH scenario as the explanation of MBHs.