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 fluctuations 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 language | English |
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Article number | 017 |
Journal | Journal of Cosmology and Astroparticle Physics |
Volume | 2017 |
Issue number | 8 |
DOIs | |
State | Published - 16 Aug 2017 |
Bibliographical note
Publisher Copyright:© 2017 IOP Publishing Ltd and Sissa Medialab.
Keywords
- absorption and radiation processes
- physics of the early universe
- primordial black holes