Spin of primordial black holes in the model with collapsing domain walls

Eroshenko, Yury N.

doi:10.48550/arxiv.2111.03403

Cited by 3 publications

(3 citation statements)

References 32 publications

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“…Moreover, while it is thought that PBH formed during radiation domination will typically be mostly slowly rotating [51,52] away from this scenario PBH can exhibit appreciable (even extreme) spins, see e.g. [53][54][55]. To our knowledge, limits on this mixed PBH-particle dark matter scenario have not been explored in these more complicated settings, and we intend to explore some of these extensions in subsequent work.…”

Section: Discussionmentioning

confidence: 99%

Improved Constraints on Dark Matter Annihilations Around Primordial Black Holes

Chanda¹,

Scholtz²,

Unwin³

2022

Preprint

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Cosmology may give rise to appreciable populations of both particle dark matter and primordial black holes (PBH) with the combined mass density providing the observationally inferred value Ω DM ≈ 0.26. However, previous studies have highlighted that scenarios with both particle dark matter and PBH are strongly excluded by γ-ray limits for particle dark matter with a velocity independent thermal cross section σv ∼ 3 × 10 −26 cm 3 /s, as is the case for classic WIMP dark matter. Here we extend these existing studies on s-wave annihilating particle dark matter to ascertain the limits from diffuse γ-rays on velocity dependent annihilations which are p-wave with σv ∝ v 2 or d-wave with σv ∝ v 4 , which we find to be considerably less constraining. Furthermore, we highlight that even if the freeze-out process is p-wave it is relatively common for (loop/phase-space) suppressed s-wave processes to actually provide the leading contributions to the experimentally constrained γ-ray flux from the PBH halo. This work also utilyses a refined treatment of the PBH dark matter density profile and outlines an improved application of extra-galactic γ-ray bounds.

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Section: Discussionmentioning

confidence: 99%

Improved Constraints on Dark Matter Annihilations Around Primordial Black Holes

Chanda¹,

Scholtz²,

Unwin³

2022

Preprint

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“…However, in alternative scenarios, such as the formation from an assembly of matter-like objects (particles, Q-balls, oscillons, etc. ), domain walls and heavy quarks of a confining gauge theory, larger PBH spins at formation are predicted [37,[246][247][248][249][250][251]. In case PBHs possessed a non-vanishing spin, one would expect superradiant instabilities to take place already in the early Universe and remove most of the angular momentum, leaving a population of slowly rotating PBHs.…”

Section: Black Hole Superradiancementioning

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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“…There are other possible scenarios, such as formation from assembly of matterlike objects (particles, Q-balls, oscillons, etc. ), domain walls and heavy quarks of a confining gauge theory, which may lead to different predictions for the PBH spin at formation [100][101][102][103]. For instance, during an early matter-dominated phase, possibly following the end of inflation and preceding the reheating phase, PBHs may be formed in a pressureless environment and develop initial large, and possibly maximal, spins [100,104].…”

Section: B Pbh Masses and Spinsmentioning

confidence: 99%

How to assess the primordial origin of single gravitational-wave events with mass, spin, eccentricity, and deformability measurements

Franciolini,

Cotesta,

Loutrel

et al. 2021

Preprint

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A population of primordial black holes formed in the early Universe could contribute to at least a fraction of the black-hole merger events detectable by current and future gravitational-wave interferometers. With the ever-increasing number of detections, an important open problem is how to discriminate whether a given event is of primordial or astrophysical origin. We systematically present a comprehensive and interconnected list of discriminators that would allow us to rule out, or potentially claim, the primordial origin of a binary by measuring different parameters, including redshift, masses, spins, eccentricity, and tidal deformability. We estimate how accurately future detectors (such as the Einstein Telescope and LISA) could measure these quantities, and we quantify the constraining power of each discriminator for current interferometers. We apply this strategy to the GWTC-3 catalog of compact binary mergers. We show that current measurement uncertainties do not allow us to draw solid conclusions on the primordial origin of individual events, but this may become possible with next-generation ground-based detectors.

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Spin of primordial black holes in the model with collapsing domain walls

Cited by 3 publications

References 32 publications

Improved Constraints on Dark Matter Annihilations Around Primordial Black Holes

Improved Constraints on Dark Matter Annihilations Around Primordial Black Holes

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

How to assess the primordial origin of single gravitational-wave events with mass, spin, eccentricity, and deformability measurements

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