Merger rates in primordial black hole clusters without initial binaries

Research output: Contribution to journal › Journal article › Research › peer-review

Standard

Merger rates in primordial black hole clusters without initial binaries. / Korol, Valeriya; Mandel, Ilya; Miller, M. Coleman; Church, Ross P.; Davies, Melvyn B.

In: Monthly Notices of the Royal Astronomical Society, Vol. 496, No. 1, 07.2020, p. 994-1000.

Research output: Contribution to journal › Journal article › Research › peer-review

Harvard

Korol, V, Mandel, I, Miller, MC, Church, RP & Davies, MB 2020, 'Merger rates in primordial black hole clusters without initial binaries', Monthly Notices of the Royal Astronomical Society, vol. 496, no. 1, pp. 994-1000. https://doi.org/10.1093/mnras/staa1644

APA

Korol, V., Mandel, I., Miller, M. C., Church, R. P., & Davies, M. B. (2020). Merger rates in primordial black hole clusters without initial binaries. Monthly Notices of the Royal Astronomical Society, 496(1), 994-1000. https://doi.org/10.1093/mnras/staa1644

Vancouver

Korol V, Mandel I, Miller MC, Church RP, Davies MB. Merger rates in primordial black hole clusters without initial binaries. Monthly Notices of the Royal Astronomical Society. 2020 Jul;496(1):994-1000. https://doi.org/10.1093/mnras/staa1644

Author

Korol, Valeriya ; Mandel, Ilya ; Miller, M. Coleman ; Church, Ross P. ; Davies, Melvyn B. / Merger rates in primordial black hole clusters without initial binaries. In: Monthly Notices of the Royal Astronomical Society. 2020 ; Vol. 496, No. 1. pp. 994-1000.

Bibtex

@article{5d546afa652a4816a6e61ecefc768761,
title = "Merger rates in primordial black hole clusters without initial binaries",
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 similar to 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.",
keywords = "gravitational waves, cosmology: dark matter, black hole mergers, DYNAMICAL EVOLUTION, PERTURBATIONS",
author = "Valeriya Korol and Ilya Mandel and Miller, {M. Coleman} and Church, {Ross P.} and Davies, {Melvyn B.}",
year = "2020",
month = jul,
doi = "10.1093/mnras/staa1644",
language = "English",
volume = "496",
pages = "994--1000",
journal = "Royal Astronomical Society. Monthly Notices",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "1",

}

RIS

TY - JOUR

T1 - Merger rates in primordial black hole clusters without initial binaries

AU - Korol, Valeriya

AU - Mandel, Ilya

AU - Miller, M. Coleman

AU - Church, Ross P.

AU - Davies, Melvyn B.

PY - 2020/7

Y1 - 2020/7

N2 - 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 similar to 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.

AB - 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 similar to 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.

KW - gravitational waves

KW - cosmology: dark matter

KW - black hole mergers

KW - DYNAMICAL EVOLUTION

KW - PERTURBATIONS

U2 - 10.1093/mnras/staa1644

DO - 10.1093/mnras/staa1644

M3 - Journal article

VL - 496

SP - 994

EP - 1000

JO - Royal Astronomical Society. Monthly Notices

JF - Royal Astronomical Society. Monthly Notices

SN - 0035-8711

IS - 1

ER -

ID: 247982967