Dark Matter Annihilation in the Gravitational Field of a Black Hole

Baushev, A. N.

doi:10.1142/s0218271809014509

Cited by 36 publications

(44 citation statements)

References 4 publications

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“…Another possible annihilation model is based on a resonant reaction at some energy above the DM rest mass, as suggested in Baushev (2009). If the cross-section increases sharply around a given center-of-mass energy, this would have the effect of focusing in on a relatively narrow volume of physical space around the black hole, as in Figure 15.…”

Section: Observabilitymentioning

confidence: 99%

The Distribution and Annihilation of Dark Matter Around Black Holes

Schnittman

2015

ApJ

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We use a Monte Carlo code to calculate the geodesic orbits of test particles around Kerr black holes, generating a distribution function of both bound and unbound populations of dark matter (DM) particles. From this distribution function, we calculate annihilation rates and observable gamma-ray spectra for a few simple DM models. The features of these spectra are sensitive to the black hole spin, observer inclination, and detailed properties of the DM annihilation cross-section and density profile. Confirming earlier analytic work, we find that for rapidly spinning black holes, the collisional Penrose process can reach efficiencies exceeding 600%, leading to a high-energy tail in the annihilation spectrum. The high particle density and large proper volume of the region immediately surrounding the horizon ensures that the observed flux from these extreme events is non-negligible.

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Section: Observabilitymentioning

confidence: 99%

The Distribution and Annihilation of Dark Matter Around Black Holes

Schnittman

2015

ApJ

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“…We show that the center-of-mass energy of a head-on collision at a 1 In Ref. [44], the upper bound of the center-of-mass energy of two falling particles which are at rest at infinity with an equal mass m is obtained as E cm = 2 √ 5m in the Schwarzschild spacetime.…”

Section: Introductionmentioning

confidence: 82%

High energy particle collisions in static, spherically symmetric black-hole-like wormholes

Tsukamoto

Kokubu

2020

Phys. Rev. D

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A Damour-Solodukhin wormhole with a metric which is similar to a Schwarzschild black hole seems to be a black hole mimicker since it is difficult to distinguish them by practical astrophysical observations. In this paper, we investigate a center-of-mass energy for the collision of two test particles in the Damour-Solodukhin wormhole spacetime. We show that the center-of-mass energy for the head-on collision of the particles is large if the difference between the metrics of the wormhole and the black hole is small. To deeply understand the high energy particle collision, we generalize the head-on collision to static, spherically symmetric black-hole-like wormholes.

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“…In this section, we would like to derive the dark matter phase-space distribution in the vicinity of a extremal NCGS black hole. The distribution around the Schwarzschild black hole has been discussed in [1] and here we generalized it to the case of extremal NCGS black hole. We will assume those are non-interacting and non-relativistic DMPs and their speed are estimated a few hundred kilometers per second in the Galaxies.…”

Section: Dark Matter Particle Phase-space Distributionmentioning

confidence: 99%