非表示:
キーワード:
General Relativity and Quantum Cosmology, gr-qc,Astrophysics, Cosmology and Extragalactic Astrophysics, astro-ph.CO
要旨:
The analysis of Gravitational Waves (GW) data from the Advanced LIGO provides
the mass of each companion of binary black holes as the source of GWs. The
observations reveal that the mass of events corresponding to the binary black
holes are much larger than the mass of astrophysical black holes. In this work,
we suggest the Primordial Black Holes (PBHs) as the source of LIGO events.
Assuming that $100\%$ of the dark matter is made of PBHs, we estimate the rate
at which these objects make binaries, merge and produce GWs as a function of
redshift. The gravitational lensing of GWs by PBHs can also enhance the
amplitude of the strain. We simulate GWs sourced by the binary PBHs, with the
detection threshold of $S/N>10$ for both Livingston and Handford detectors. For
the log-normal mass function of PBHs, we generate the expected distribution of
events and compare our results with the observed events and find the best value
of the mass function parameters (i.e $M_c =25 M_\odot$ and $\sigma=0.6$) in the
lognormal mass function. Comparing the expected number of events with the
number of observed ones reveals that even assuming all the dark matter is made
of PBHs are not enough to produce the observed GW events and the astrophysical
black holes should have the main contribution in the observed GW events.
