Small-scale structure and 21cm uctuations by primordial black holes

Jinn Ouk Gong, Naoya Kitajima

Research output: Contribution to journalArticlepeer-review

Abstract

We discuss early structure formation of small scales sourced by primordial black holes (PBHs) which constitute a small part of present cold dark matter component. We calculate the mass function and power spectrum of haloes originated from the Poisson uctuations of PBH number and show that the number of small haloes is significantly modified in the presence of PBHs even if their fraction accounts for only 10..4{10..3 of total dark matter abundance. We then compute the subsequent 21cm signature from those haloes. We find that PBHs can provide major contributions at high redshifts within the detectability of future experiments such as Square Kilometer Array, and provide a forecast constraint on the PBH fraction.

Original languageEnglish
JournalUnknown Journal
Publication statusPublished - 2017 Apr 13

ASJC Scopus subject areas

  • General

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