$\mathcal O(10) M_\odot$ primordial black holes and string axion dark matter
Abstract
LIGO-Virgo collaboration has found black holes as heavy as through the detections of the gravitational waves emitted during their mergers. Primordial black holes (PBHs) produced by inflation could be an origin of such events. While it is tempting to presume that these PBHs constitute all Dark Matter (DM), there exists a number of constraints for PBHs with which contradict with the idea of PBHs as all DM. Also, it is known that weakly interacting massive particle (WIMP) that is a common DM candidate is almost impossible to coexist with PBHs. These observations motivate us to pursue another candidate of DM. In this paper, we assume that the string axion solving the strong CP problem makes up all DM, and discuss the coexistence of string axion DM and inflationary PBHs for LIGO events.
Keywords
Cite
@article{arxiv.1709.07865,
title = {$\mathcal O(10) M_\odot$ primordial black holes and string axion dark matter},
author = {Keisuke Inomata and Masahiro Kawasaki and Kyohei Mukaida and Yuichiro Tada and Tsutomu T. Yanagida},
journal= {arXiv preprint arXiv:1709.07865},
year = {2018}
}
Comments
12 pages, 8 figures; v2: published version