Gravitational waves from primordial black hole mergers

Raidal, M.; Vaskonen, Ville; Veermäe, Hardi

doi:10.1088/1475-7516/2017/09/037

Cited by 333 publications

(393 citation statements)

References 133 publications

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“…In particular, the LIGO constraint taken from Ref. [56] assumes the PBH binary formation mechanism introduced in [57], which has been criticized e.g., in Ref. [38].…”

Section: Resultsmentioning

confidence: 99%

Constraining primordial black holes with the EDGES 21-cm absorption signal

et al. 2018

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The EDGES experiment has recently measured an anomalous global 21-cm spectrum due to hydrogen absorptions at redshifts of about z ∼ 17. Model independently, the unusually low temperature of baryons probed by this observable sets strong constraints on any physical process that transfers energy into the baryonic environment at such redshifts. Here, we make use of the 21-cm spectrum to derive bounds on the energy injection due to a possible population of Oð1-100ÞM ⊙ primordial black holes, which induce a wide spectrum of radiation during the accretion of the surrounding gas. After calculating the total radiative intensity of a primordial black hole population, we estimate the amount of heat and ionizations produced in the baryonic gas and compute the resulting thermal history of the Universe with a modified version of RECFAST code. Finally, by imposing that the temperature of the gas at z ∼ 17 does not exceed the indications of EDGES, we constrain the possible abundance of primordial black holes. Depending on uncertainties related to the accretion model, we find that Oð10ÞM ⊙ primordial black holes can only contribute to a fraction f PBH < ð1-10 −3 Þ of the total dark matter abundance.

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“…In particular, the LIGO constraint taken from Ref. [56] assumes the PBH binary formation mechanism introduced in [57], which has been criticized e.g., in Ref. [38].…”

Section: Resultsmentioning

confidence: 99%

Constraining primordial black holes with the EDGES 21-cm absorption signal

et al. 2018

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“…Various attempts have been made to estimate the merger rate distribution of PBH binaries when PBHs have an extended mass function [10,55,58,59]. In particular, a formalism to estimate the effect of merger history of PBHs on merger rate distribution has been developed in [60], and it is argued that the multiple-merger effect may not be ignored if PBHs have a power-law or a lognormal mass function by choosing some specific parameter values of the mass function.…”

Section: Introductionmentioning

confidence: 99%

Merger history of primordial black-hole binaries

Wu¹

2020

Phys. Rev. D

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As a candidate of dark matter, primordial black holes (PBHs) have attracted more and more attentions as they could be possible progenitors of the heavy binary black holes (BBHs) observed by LIGO/Virgo. Accurately estimating the merger rate of PBH binaries will be crucial to reconstruct the mass distribution of PBHs. It was pointed out the merger history of PBHs may shift the merger rate distribution depending on the mass function of PBHs. In this paper, we use 10 BBH events from LIGO/Virgo O1 and O2 observing runs to constrain the merger rate distribution of PBHs by accounting the effect of merger history. It is found that the second merger process makes subdominant contribution to the total merger rate, and hence the merger history effect can be safely neglected.

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“…where dn pairs = n PBH 2 dN (x)dN (y)e −N (y) d cos θ 2 (10) is the density of initial configurations specified by x, y and θ, and…”

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confidence: 99%

Lower bound on the primordial black hole merger rate

2020

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We derive a lower bound on the merger rate of primordial black hole (PBH) binaries by estimating the maximal fraction of binaries that were disrupted between formation in the early universe and merger, and computing the merger rate of disrupted binaries. This implies robust constraints on the PBH abundance in the range 1 − 100M . We further show that LIGO/Virgo design sensitivity has the potential to reach the PBH mass range of 10 −2 − 10 3 M . These constraints are stronger if PBH are initially spatially clustered.

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Gravitational waves from primordial black hole mergers

Cited by 333 publications

References 133 publications

Constraining primordial black holes with the EDGES 21-cm absorption signal

Constraining primordial black holes with the EDGES 21-cm absorption signal

Merger history of primordial black-hole binaries

Lower bound on the primordial black hole merger rate

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