PBH formation from spherically symmetric hydrodynamical perturbations: a review

Escrivà, Albert

doi:10.48550/arxiv.2111.12693

Cited by 6 publications

(10 citation statements)

References 200 publications

(374 reference statements)

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“…This classification could obviously be extended to older or to be published constraints. In this study, we have used method M 1 1 for existing instruments and compared methods M 1 2 and M 2 2 for prospective instruments.…”

Section: Instrument Implementationmentioning

confidence: 99%

Limits on primordial black holes detectability with Isatis: A BlackHawk tool

Auffinger

2022

Preprint

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Primordial black holes (PBHs) are convenient candidates to explain the elusive dark matter (DM). However, years of constraints from various astronomical observations have constrained their abundance over a wide range of masses, leaving only a narrow window open at 10 17 g M 10 22 g for all DM in the form of PBHs. We reexamine this disputed window with a critical eye, interrogating the general hypotheses underlying the direct photon constraints. We review 4 levels of assumptions: i) instrument characteristics, ii) prediction of the (extra)galactic photon flux, iii) statistical method of signal-to-data comparison and iv) computation of the Hawking radiation rate. Thanks to Isatis, a new tool designed for the public Hawking radiation code BlackHawk, we first revisit the existing and prospective constraints on the PBH abundance and investigate the impact of assumptions i)-iv). We show that the constraints can vary by several orders of magnitude, advocating the necessity of a reduction of the theoretical sources of uncertainties. Second, we consider an "ideal" instrument and we demonstrate that the PBH DM scenario can only be constrained by the direct photon Hawking radiation phenomenon below Mmax ∼ 10 20 g. The upper part of the mass window should therefore be closed by other means.

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Section: Instrument Implementationmentioning

confidence: 99%

Limits on primordial black holes detectability with Isatis: A BlackHawk tool

Auffinger

2022

Preprint

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“…PBHs may form at very high redshift [8,9,[109][110][111][112][113][114] if the density perturbations overcome the threshold for collapse [50,115]. Their mass m PBH is comparable to the mass contained in the cosmological horizon at the time of formation.…”

Section: Gravitational Waves From Pbh Formation and Evaporationmentioning

confidence: 99%

Hunt for Light Primordial Black Hole Dark Matter with Ultra-High-Frequency Gravitational Waves

Franciolini¹,

Maharana²,

Muia³

2022

Preprint

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Light primordial black holes may comprise a dominant fraction of the dark matter in our Universe. This paper critically assesses whether planned and future gravitational wave detectors in the ultra-high-frequency band could constrain the fraction of dark matter composed of sub-solar primordial black holes. Adopting the state-of-the-art description of primordial black hole merger rates, we compare various signals with currently operating and planned detectors. As already noted in the literature, our findings confirm that detecting individual primordial black hole mergers with currently existing and operating proposals remains difficult. Current proposals involving gravitational wave to electromagnetic wave conversion in a static magnetic field and microwave cavities feature a technology gap with respect to the loudest gravitational wave signals from primordial black holes of various orders of magnitude. However, we point out that one recent proposal involving resonant LC circuits represents the best option in terms of individual merger detection prospects in the range (1 ÷ 100) MHz. In the same frequency range, we note that alternative setups involving resonant cavities, whose concept is currently under development, might represent a promising technology to detect individual merger events. We also show that a detection of the stochastic gravitational wave background produced by unresolved binaries is possible only if the theoretical sensitivity of the proposed Gaussian beam detector is achieved. Such a detector, whose feasibility is subject to various caveats, may be able to rule-out some scenarios for asteroidal mass primordial black hole dark matter. We conclude that pursuing dedicated studies and developments of gravitational wave detectors in the ultra-high-frequency band remains motivated and may lead to novel probes on the existence of light primordial black holes.

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“…We refer the reader to Refs. [78][79][80][81][82][83] for recent reviews. The resulting interest of the cosmology community in PBHs and induced GWs, has led to a thorough study of several mechanisms to enhance the primordial spectrum of fluctuations during inflation.…”

Section: Introductionmentioning

confidence: 99%

Induced gravitational waves from slow-roll inflation after an enhancing phase

Balaji,

Domenech,

Silk

2022

Preprint

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The primordial spectrum of fluctuations may present a large peak as a result of enhancing features during inflation. This may include, but is not limited to, bumps in the inflaton's potential, phases of ultra-slow-roll or turns in multi-field space. However, in many models, inflation does not end immediately after the enhancing feature and it is likely to continue with a second phase of slow-roll. We show that the resulting induced gravitational waves may probe the primordial spectrum from the second inflationary phase, even if its amplitude is too small to directly induce detectable gravitational waves. This is because, if there are sharp peaks in the primordial spectrum, the total gravitational wave spectrum is not simply the sum of gravitational waves induced by a peaked and scale-invariant primordial spectra separately, but cross terms from interaction between these modes also become important. We also find that such cross terms always have a characteristic slope. We discuss the parameter space that may be probed by future gravitational waves detectors in the presence of these signals.

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PBH formation from spherically symmetric hydrodynamical perturbations: a review

Cited by 6 publications

References 200 publications

Limits on primordial black holes detectability with Isatis: A BlackHawk tool

Limits on primordial black holes detectability with Isatis: A BlackHawk tool

Hunt for Light Primordial Black Hole Dark Matter with Ultra-High-Frequency Gravitational Waves

Induced gravitational waves from slow-roll inflation after an enhancing phase

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