scholarly journals Erratum: Prospective constraints on the primordial black hole abundance from the stochastic gravitational-wave backgrounds produced by coalescing events and curvature perturbations [Phys. Rev. D 99 , 103531 (2019)]

2020 ◽  
Vol 101 (6) ◽  
Author(s):  
Sai Wang ◽  
Takahiro Terada ◽  
Kazunori Kohri
Keyword(s):  
Black Hole ◽  
Gravitational Wave ◽  
Primordial Black Hole

scholarly journals Gravitational wave production right after a primordial black hole evaporation

2020 ◽  
Vol 101 (12) ◽  
Author(s):  
Keisuke Inomata ◽  
Masahiro Kawasaki ◽  
Kyohei Mukaida ◽  
Takahiro Terada ◽  
Tsutomu T. Yanagida
Keyword(s):  
Black Hole ◽  
Gravitational Wave ◽  
Primordial Black Hole ◽  
Black Hole Evaporation

scholarly journals Formation of low-spinning 100 M⊙ black holes

2020 ◽  
Vol 640 ◽  
pp. L20
Author(s):  
K. Belczynski ◽  
S. Banerjee
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Gravitational Wave ◽  
Globular Clusters ◽  
Primordial Black Hole ◽  
Massive Black Hole ◽  
Mass Gap ◽  
High Speeds ◽  
Nuclear Clusters ◽  
Nuclear Cluster

Aims. It is speculated that a merger of two massive stellar-origin black holes in a dense stellar environment may lead to the formation of a massive black hole in the pair-instability mass gap (∼50−135 M⊙). Such a merger-formed black hole is expected to typically have a high spin (a ∼ 0.7). If such a massive black hole acquires another black hole it may lead to another merger detectable by LIGO/Virgo in gravitational waves. Acquiring a companion may be hindered by gravitational-wave kick/recoil, which accompanies the first merger and may quickly remove the massive black hole from its parent globular or nuclear cluster. We test whether it is possible for a massive merger-formed black hole in the pair-instability gap to be retained in its parent cluster and have low spin. Such a black hole would be indistinguishable from a primordial black hole. Methods. We employed results from numerical relativity calculations of black hole mergers to explore the range of gravitational-wave recoil velocities for various combinations of merging black hole masses and spins. We compared merger-formed massive black hole speeds with typical escape velocities from globular and nuclear clusters. Results. We show that a globular cluster is highly unlikely to form and retain a ∼100 M⊙ black hole if the spin of the black hole is low (a ≲ 0.3). Massive merger-formed black holes with low spins acquire high recoil speeds (≳ 200 km s−1) from gravitational-wave kick during formation that exceed typical escape speeds from globular clusters (∼ 50 km s−1). However, a very low-spinning (a ∼ 0.1) and massive (∼100 M⊙) black hole could be formed and retained in a galactic nuclear star cluster. Even though such massive merger-formed black holes with such low spins acquire high speeds during formation (∼ 400 km s−1), they may avoid ejection since massive nuclear clusters have high escape velocities (∼ 300−500 km s−1). A future detection of a massive black hole in the pair-instability mass gap with low spin would therefore not be proof of the existence of primordial black holes, which are sometimes claimed to have low spins and arbitrarily high masses.

scholarly journals Constraining the primordial black hole scenario with Bayesian inference and machine learning: The GWTC-2 gravitational wave catalog

2021 ◽  
Vol 103 (2) ◽  
Author(s):  
Kaze W. K. Wong ◽  
Gabriele Franciolini ◽  
Valerio De Luca ◽  
Vishal Baibhav ◽  
Emanuele Berti ◽  
...  
Keyword(s):  
Machine Learning ◽  
Black Hole ◽  
Bayesian Inference ◽  
Gravitational Wave ◽  
Primordial Black Hole
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