Sublunar-mass primordial black holes from closed axion domain walls

Ge, Shuailiang

doi:10.1016/j.dark.2019.100440

Cited by 22 publications

(11 citation statements)

References 82 publications

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“…Our work can be extended further. There are other mechanisms of forming PBHs, such as bubble collisions [193][194][195][196][197][198] or delayed vacuum decay [199][200][201][202] from a FOPT, or the collapse of domain walls [203][204][205]. Studying the features of those other mechanisms and the possibility of identifying them in experiments would be interesting.…”

Section: Summary and Discussionmentioning

confidence: 99%

Pinning down the primordial black hole formation mechanism with gamma-rays and gravitational waves

Xie¹

2023

Preprint

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Primordial black holes (PBHs) are predicted in many models via different formation mechanisms. Identifying the origin of PBHs is of the same importance as probing their existence. We propose to probe the asteroid-mass PBHs [O(10 17 ) g M O(10 22 ) g] with gamma-rays from Hawking radiation and the stochastic gravitational waves (GWs) from the early Universe. We consider four concrete formation mechanisms, including collapse from primordial curvature perturbations, first-order phase transitions, or cosmic strings, and derive the extended PBH mass functions of each mechanism for phenomenological study. The results demonstrate that by combining gamma-rays and GW signals we can probe PBHs up to O(10 19 ) g and identify their physical origins.

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Section: Summary and Discussionmentioning

confidence: 99%

Pinning down the primordial black hole formation mechanism with gamma-rays and gravitational waves

Xie¹

2023

Preprint

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“…Criterion ( 12) is always satisfied. For M bh > 10 23 g, criterion (13) is more stringent than (14), while for M bh < 10 23 g, it's the opposite. As expected, the ignition cross-section πR 2 m increases with PBH mass.…”

Section: A Wd Modelingmentioning

confidence: 96%

“…PBHs in the asteroid mass window (10 20 − 10 23 g) are compelling candidates for dark matter (DM), since they are formed naturally during inflation [10][11][12][13][14] and still resist all observational constraints [15][16][17][18][19]. Given their potentially huge number density, encounters with stellar objects should be frequent enough to be relevant on cosmological time scales.…”

Section: Introductionmentioning

confidence: 99%

Bondi-Hoyle-Lyttleton Accretion in a Reactive Medium: Detonation Ignition and a Mechanism for Type Ia Supernovae

Steigerwald,

Tejeda

2021

Preprint

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Detonation initiation in a reactive medium can be achieved by an externally created shock wave. Supersonic flow onto a gravitating center, known as Bondi-Hoyle-Lyttleton (BHL) accretion, is a natural shock wave creating process, but, to our knowledge, a reactive medium has never been considered in the literature. Here, we conduct an order of magnitude analysis to investigate under which conditions the shock-induced reaction zone recouples to the shock front. We derive three semi-analytical criteria for self-sustained detonation ignition. We apply these criteria to the special situation where a primordial black hole (PBH) of asteroid mass traverses a carbon-oxygen white dwarf (WD). Since detonations in carbon-oxygen WDs are supposed to produce normal thermonuclear supernovae (SNe Ia), the observed SN Ia rate constrains the fraction of dark matter (DM) in the form of PBHs as log 10 (f pbh ) < 0.8 log 10 (m bh /g) − 18 in the range 10 21 − 10 22 g (10 20 − 10 22 g) from a conservative (optimistic) analysis. Most importantly, these encounters can account for both the rate and the median explosion mass of normal sub-Chandrasekhar SNe Ia if a significant fraction of DM is in the form of PBHs with mass 10 23 g.

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“…Since the tunneling rate is exponentially suppressed by the Euclidean action of DWs, S E , the DW problem is naturally avoided in this scenario. We consider the case that DWs have nonnegligible interaction with the matter fields so that the energy stored in DWs finally transforms into background radiation [39][40][41], rather than primordial black holes (PBHs) [42][43][44][45][46]. According to Birkhoff's theorem, the collapse of a single spherical DW cannot produce gravitational waves (GWs).…”

Section: Introductionmentioning

confidence: 99%

Enhanced curvature perturbations from spherical domain walls nucleated during inflation

Zhen-Min¹,

Liu²,

Guo³

2023

Preprint

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We investigate spherical domain walls (DWs) nucleated via quantum tunneling in multifield inflationary models and curvature perturbations induced by the inhomogeneous distribution of those DWs. We consider the case that the Euclidean action SE of DWs changes with time during inflation so that most of DWs nucleate when SE reaches the minimum value and the radii of DWs are almost the same. When the Hubble horizon scale exceeds the DW radius after inflation, DWs begin to annihilate and release their energy into background radiation. Because of the random nature of the nucleation process, the statistics of DWs is of the Poisson type and the power spectrum of curvature perturbations has a characteristic slope PR(k) ∝ k 3 . The amplitude of PR(k) depends on the tension and abundance of DWs at the annihilation time while the peak mode depends on the mean separation of DWs. We also numerically obtain the energy spectra of scalar-induced gravitational waves from predicted curvature perturbations which are expected to be observed in multiband gravitational-wave detectors.

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Sublunar-mass primordial black holes from closed axion domain walls

Cited by 22 publications

References 82 publications

Pinning down the primordial black hole formation mechanism with gamma-rays and gravitational waves

Pinning down the primordial black hole formation mechanism with gamma-rays and gravitational waves

Bondi-Hoyle-Lyttleton Accretion in a Reactive Medium: Detonation Ignition and a Mechanism for Type Ia Supernovae

Enhanced curvature perturbations from spherical domain walls nucleated during inflation

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