Gravitational waves from primordial black holes collisions in binary systems

It was shown by (Nakamura et al. 1997), (Ioka et al. 1998), and (Sasaki et al. 2016) that primordial black holes (PBHs) binaries can form effectively at the cosmological stage of radiation dominance, and the merge of the PBHs in pairs can explain the gravitational wave burst GW150914. In this paper, the model is re-examined by considering the effect of inflationary dark matter density perturbations which produce additional tidal forces. As a result, the merge rate of PBHs binaries and the corresponding rate of the gravitational bursts can be suppressed by the factor ≈ 1.5 − 2 in comparison with previous calculations. This rate matches the LIGO data if the PBHs constitute the f ≈ 5 × 10-4 − 5 × 10-3 fraction of dark matter.

Note:

6 pages, 2 figures, Presented at the Conference on Physical Interpretation of Relativity Theory (PIRT-2017), Moscow, Russia

gravitational radiation: emission
gravitational radiation: burst
black hole: primordial
density: perturbation
binary: coalescence
gravitation
dark matter
gravitational radiation detector
inflation
black hole: formation

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