scholarly journals Testing stochastic gravitational wave signals from primordial black holes with optical telescopes

2021 ◽  
Vol 814 ◽  
pp. 136097
Author(s):  
Sunao Sugiyama ◽  
Volodymyr Takhistov ◽  
Edoardo Vitagliano ◽  
Alexander Kusenko ◽  
Misao Sasaki ◽  
...  
Keyword(s):  
Black Holes ◽  
Gravitational Wave ◽  
Primordial Black Holes ◽  
Optical Telescopes

scholarly journals Formation and Clustering of Primordial Black Holes in Brans-Dicke Theory

Universe ◽  
2020 ◽  
Vol 6 (10) ◽  
pp. 158
Author(s):  
Victor Berezin ◽  
Vyacheslav Dokuchaev ◽  
Yury Eroshenko ◽  
Alexey Smirnov
Keyword(s):  
Black Holes ◽  
Scalar Field ◽  
Gravitational Wave ◽  
Significant Contribution ◽  
Threshold Value ◽  
Primordial Black Holes ◽  
Cosmological Horizon ◽  
Scalar Tensor Theory ◽  
Tensor Theory ◽  
Density Perturbations

The formation of primordial black holes in the early universe in the Brans-Dicke scalar-tensor theory of gravity is investigated. Corrections to the threshold value of density perturbations are found. Above the threshold, the gravitational collapse occurs after the cosmological horizon crossing. The corrections depend in a certain way on the evolving scalar field. They affect the probability of primordial black holes formation, and can lead to their clustering at large scales if the scalar field is inhomogeneous. The formation of the clusters, in turn, increases the probability of black holes merge and the corresponding rate of gravitational wave bursts. The clusters can provide a significant contribution to the LIGO/Virgo gravitational wave events, if part of the observed events are associated with primordial black holes.

scholarly journals Gravitational wave anisotropies from primordial black holes

2020 ◽  
Vol 2020 (02) ◽  
pp. 028-028 ◽  
Author(s):  
N. Bartolo ◽  
D. Bertacca ◽  
V. De Luca ◽  
G. Franciolini ◽  
S. Matarrese ◽  
...  
Keyword(s):  
Black Holes ◽  
Gravitational Wave ◽  
Primordial Black Holes

scholarly journals Merger rates in primordial black hole clusters without initial binaries

2020 ◽  
Vol 496 (1) ◽  
pp. 994-1000 ◽  
Author(s):  
Valeriya Korol ◽  
Ilya Mandel ◽  
M Coleman Miller ◽  
Ross P Church ◽  
Melvyn B Davies
Keyword(s):  
Black Holes ◽  
Gravitational Wave ◽  
Matter Content ◽  
Density Fluctuations ◽  
Primordial Black Hole ◽  
Primordial Black Holes ◽  
Order Of Magnitude ◽  
Three Body ◽  
Small Clusters ◽  
The Universe

ABSTRACT Primordial black holes formed through the collapse of cosmological density fluctuations have been hypothesized as contributors to the dark matter content of the Universe. At the same time, their mergers could contribute to the recently observed population of gravitational-wave sources. We investigate the scenario in which primordial black holes form binaries at late times in the Universe. Specifically, we re-examine the mergers of primordial black holes in small clusters of ∼30 objects in the absence of initial binaries. Binaries form dynamically through Newtonian gravitational interactions. These binaries act as heat sources for the cluster, increasing the cluster’s velocity dispersion, which inhibits direct mergers through gravitational-wave two-body captures. Meanwhile, three-body encounters of tight binaries are too rare to tighten binaries sufficiently to allow them to merge through gravitational-wave emission. We conclude that in the absence of initial binaries, merger rates of primordial black holes in the considered scenario are at least an order of magnitude lower than previously suggested, which makes gravitational-wave detections of such sources improbable.

scholarly journals Gravitational wave bursts from collisions of primordial black holes in clusters

2009 ◽  
Vol 35 (3) ◽  
pp. 143-149 ◽  
Author(s):  
V. I. Dokuchaev ◽  
Yu. N. Eroshenko ◽  
S. G. Rubin
Keyword(s):  
Black Holes ◽  
Gravitational Wave ◽  
Primordial Black Holes ◽  
Wave Bursts

scholarly journals Were recently reported MHz events planet mass primordial black hole mergers?

2021 ◽  
Vol 81 (11) ◽  
Author(s):  
Guillem Domènech
Keyword(s):  
Black Holes ◽  
Gravitational Wave ◽  
High Frequency ◽  
Short Note ◽  
Oort Cloud ◽  
Bulk Acoustic Wave ◽  
Primordial Black Hole ◽  
Primordial Black Holes ◽  
Wave Antenna ◽  
High Frequency Waves

AbstractA bulk acoustic wave cavity as high frequency gravitational wave antenna has recently detected two rare events at 5.5MHz. Assuming that the detected events are due to gravitational waves, their characteristic strain amplitude lies at about $$h_c\approx 2.5 \times 10^{-16}$$ h c ≈ 2.5 × 10 - 16 . While a cosmological signal is out of the picture due to the large energy carried by the high frequency waves, the signal could be due to the merging of two planet mass primordial black holes ($$\approx 4\times 10^{-4} M_\odot $$ ≈ 4 × 10 - 4 M ⊙ ) inside the Oort cloud at roughly 0.025 pc (5300 AU) away. In this short note, we show that the probability of one such event to occur within this volume per year is around $$1:10^{24}$$ 1 : 10 24 , if such Saturn-like mass primordial black holes are $$1\%$$ 1 % of the dark matter. Thus, the detected signal is very unlikely to be due the merger of planet mass primordial black holes. Nevertheless, the stochastic background of saturn mass primordial black holes binaries might be seen by next generation gravitational wave detectors, such as DECIGO and BBO.

Sign in / Sign up

Export Citation Format

Share Document