タイトル:
Primordial Black Hole Cosmology

アブストラクト:
After aLIGO detected the gravitational wave produced by mergers of
binary black holes (BHs), researchers have aggressively studied the
origin of the BHs with masses of the order of O(10) M_sun. In addition
to astrophysical origins through evolutions of Pop.III/Pop.II stars,
one of the attractive candidates of those BHs should be Primordial
Black Holes (PBHs). The PBHs can be normally produced in the early
radiation dominated Universe due to spherical collapses of regions
which have a large density perturbation. I will review the current
status of cosmological and astrophysical constraints on PBHs with
introducing my own recent bounds on PBHs in terms of accretions of
baryon onto PBHs (in progress), polarization of CMB photons
(arXiv:1707.04206 [astro-ph.CO]), Higgs phenomenology
(arXiv:1708.02138 [hep-ph]) and so on. In addition, I will discuss a
new production mechanism of a PBH in the early matter dominated
Universe with taking a serios attitude towards a suppression due to
conservations of angular momentum during its collapsing phase
(arXiv:1707.03595 [gr-qc]) and possible applications of this mechanism
to cosmology.