http://arxiv.org/abs/1904.10298
We investigate a possibility of primordial black hole (PBH) formation with a hierarchical mass spectrum in multiple phases of inflation. As an example, we find that one can simultaneously realize a mass spectrum which has recently attracted a lot of attention, stellar-mass PBHs ($\sim\calO(10)M_\odot$) as a possible source of binary black holes detected by LIGO/VIRGO collaboration, asteroid-mass ($\sim\calO(10^{-12})M_\odot$) as a main component of dark matter, and earth-mass ($\sim\calO(10^{-5})M_\odot$) as a source of ultrashort-timescale events in OGLE microlensing data [1]. The recent refined swampland conjecture may support these multi-phase inflationary scenario with hierarchical mass PBHs as a transition signal of each inflationary phase.
Y. Tada and S. Yokoyama
Wed, 24 Apr 19
1/51
Comments: 12 pages, 3 figures
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