Primordial black holes in peak theory with a non-Gaussian tail

Kitajima, Naoya; Tada, Yuichiro; Yokoyama, Shuichiro; Yoo, Chul Moon

doi:10.1088/1475-7516/2021/10/053

Cited by 56 publications

(92 citation statements)

References 92 publications

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“…Although it goes beyond the scope of the review, we should mention that one could also consider the effect of the inclusion of non-Gaussianities in Equation ( 81), which can have important consequences for the PBH abundance estimation. There are vast and extensive works that consider its impact on the thresholds and PBH abundances [103,107,108,[180][181][182][183][184][185][186][187][188][189][190][191][192][193][194][195], including some of them that have used numerical simulations following the basics shown in this review [196,197].…”

Section: Curvature Fluctuationsmentioning

confidence: 99%

PBH Formation from Spherically Symmetric Hydrodynamical Perturbations: A Review

Escrivà

2022

Universe

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Primordial black holes, which could have been formed in the very early Universe due to the collapse of large curvature fluctuations, are currently one of the most attractive and fascinating research areas in cosmology for their possible theoretical and observational implications. This review article presents the current results and developments on the conditions for primordial black hole formation from the collapse of curvature fluctuations in spherical symmetry on a Friedman–Lemaître–Robertson–Walker background and its numerical simulation. We review the appropriate formalism for the conditions of primordial black hole formation, and we detail a numerical implementation. We then focus on different results regarding the threshold and the black hole mass using different sets of curvature fluctuations. Finally, we present the current state of analytical estimations for the primordial black hole formation threshold, contrasted with numerical simulations.

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Section: Curvature Fluctuationsmentioning

confidence: 99%

PBH Formation from Spherically Symmetric Hydrodynamical Perturbations: A Review

Escrivà

2022

Universe

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“…For the effects of non-Gaussianities, see e.g., Refs. (Young & Byrnes 2013;Franciolini et al 2018;Atal & Germani 2019;De Luca et al 2019;Yoo et al 2019;Ezquiaga et al 2020;Kitajima et al 2021).…”

Section: Primordial Black Hole Modelsmentioning

confidence: 99%

Tracking the origin of black holes with the stochastic gravitational wave background popcorn signal

Braglia¹,

García-Bellido²,

Kuroyanagi³

2022

Preprint

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Unresolved sources of gravitational waves (GWs) produced by the merger of a binary of black holes at cosmological distances combine into a stochastic background. Such a background is in the continuous or popcorn regime, depending on whether the GW rate is high enough so that two or more events overlap in the same frequency band. These two regimes respectively correspond to large and small values of the so-called duty cycle. We study the detection regime of the background in models of Primordial Black Holes (PBHs) and compare it to the one produced by black holes of stellar origin. Focusing on ground-based detectors, we show that the duty cycle of the PBH-origin background is larger than that of astrophysical black holes because of differences in their mass function and the merger rate. Our study opens up the possibility to learn about the primordial or astrophysical nature of black hole populations by examining the statistical properties of the stochastic background.

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“…Particularly in the so-called peak theory, the typical profile of high peaks of the curvature fluctuation (and thus whether a PBH is formed or not) can be statistically discussed with the power spectrum if the curvature field follows the Gaussian statistics. However if the curvature fluctuation shows non-Gaussianity, the PBH abundance is expected to change substantially [1,50,54,55,[63][64][65][66][67][68][69][70][71][72][73][74][75][76]. 1 Recently, Ref.…”

Section: Introductionmentioning

confidence: 99%

“…However if the curvature fluctuation shows non-Gaussianity, the PBH abundance is expected to change substantially [1,50,54,55,[63][64][65][66][67][68][69][70][71][72][73][74][75][76]. 1 Recently, Ref. [1] studied the case of the local-type non-Gaussianity (parametrised, e.g., by the non-linearity parameter f NL ), making the direct use of the critical averaged compaction function (i.e., without the fitting formula by the q parameter).…”

Section: Introductionmentioning

confidence: 99%

“…1 Recently, Ref. [1] studied the case of the local-type non-Gaussianity (parametrised, e.g., by the non-linearity parameter f NL ), making the direct use of the critical averaged compaction function (i.e., without the fitting formula by the q parameter). As an interesting remark, according to the criterion that the critical value of the averaged compaction function is 2/5, there no type I PBH (see Eq.…”

Section: Introductionmentioning

confidence: 99%

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Simulation of Primordial Black Holes with large negative non-Gaussianity

Escrivà,

Tada,

Yokoyama

et al. 2022

Preprint

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In this work, we have performed numerical simulations of primordial black hole (PBH) formation in the Friedman-Lemaître-Robertson-Walker universe filled by radiation fluid, introducing the local-type non-Gaussianity to the primordial curvature fluctuation. We have compared the numerical results from simulations with previous analytical estimations on the threshold value for PBH formation done in the previous paper [1], particularly for negative values of the non-linearity parameter f NL . Our numerical results show the existence of PBH formation of (the so-called) type I also in the case f NL −0.336, which was not found in the previous analytical expectations using the critical averaged compaction function. In particular, although the universal value for the averaged critical compaction function Cc = 2/5 found previously in the literature is not satisfied for all the profiles considered in this work, an alternative direct analytical estimate has been found to be roughly accurate to estimate the thresholds, which gives the value of the critical averaged density with a few % deviation from the numerical one for f NL −1.

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Primordial black holes in peak theory with a non-Gaussian tail

Cited by 56 publications

References 92 publications

PBH Formation from Spherically Symmetric Hydrodynamical Perturbations: A Review

PBH Formation from Spherically Symmetric Hydrodynamical Perturbations: A Review

Tracking the origin of black holes with the stochastic gravitational wave background popcorn signal

Simulation of Primordial Black Holes with large negative non-Gaussianity

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