Testing scenarios of primordial black holes being the seeds of supermassive black holes by ultracompact minihalos and CMB μ distortions

Kazunori Kohri, Tomohiro Nakama, and Teruaki Suyama
Phys. Rev. D 90, 083514 – Published 14 October 2014

Abstract

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 6×104M5×1013M are excluded. Since PBHs lighter than 6×104M 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.

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  • Received 5 June 2014

DOI:https://doi.org/10.1103/PhysRevD.90.083514

© 2014 American Physical Society

Authors & Affiliations

Kazunori Kohri1, Tomohiro Nakama2,3, and Teruaki Suyama3

  • 1Cosmophysics Group, Theory Centre, IPNS, KEK, Tsukuba 305-0801, Japan and The Graduate University for Advanced Study (Sokendai), Tsukuba 305-0801, Japan
  • 2Department of Physics, Graduate School of Science, University of Tokyo, Tokyo 113-0033, Japan
  • 3Research Center for the Early Universe (RESCEU), Graduate School of Science, University of Tokyo, Tokyo 113-0033, Japan

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Vol. 90, Iss. 8 — 15 October 2014

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