Dark matter component decaying after recombination: constraints from diffuse gamma-ray and neutrino flux measurements

Kalashev, O.; Kuznetsov, M.; Zhezher, Yana

doi:10.1088/1475-7516/2019/10/039

Cited by 5 publications

(4 citation statements)

References 36 publications

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“…10 These methods have been taken up more recently by the authors of refs. [43,93,[96][97][98][99][100] in order to set strong constraints on heavy DM. For hadronic channels, those works disregard electroweak interactions in the evolution,…”

Section: A1 Comparison To Existing Approachesmentioning

confidence: 99%

Dark matter spectra from the electroweak to the Planck scale

Bauer

Rodd

Webber

2021

J. High Energ. Phys.

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We compute the decay spectrum for dark matter (DM) with masses above the scale of electroweak symmetry breaking, all the way to the Planck scale. For an arbitrary hard process involving a decay to the unbroken standard model, we determine the prompt distribution of stable states including photons, neutrinos, positrons, and antiprotons. These spectra are a crucial ingredient in the search for DM via indirect detection at the highest energies as being probed in current and upcoming experiments including IceCube, HAWC, CTA, and LHAASO. Our approach improves considerably on existing methods, for instance, we include all relevant electroweak interactions.

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Section: A1 Comparison To Existing Approachesmentioning

confidence: 99%

Dark matter spectra from the electroweak to the Planck scale

Bauer

Rodd

Webber

2021

J. High Energ. Phys.

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“…3 These methods have been taken up more recently by the authors of Refs. [36,[86][87][88][89][90][91] in order to set strong constraints on heavy DM. For hadronic channels, those works disregard electroweak interactions in the evolution, whereas our formalism includes these effects for all initial states.…”

Section: A Comparison To Existing Approachesmentioning

confidence: 99%

Dark Matter Spectra from the Electroweak to the Planck Scale

Bauer,

Rodd,

Webber

2020

Preprint

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We compute the decay spectrum for dark matter (DM) with masses above the scale of electroweak symmetry breaking, all the way to the Planck scale. For an arbitrary hard process involving a decay to the unbroken standard model, we determine the prompt distribution of stable states including photons, neutrinos, positrons, and antiprotons. These spectra are a crucial ingredient in the search for DM via indirect detection at the highest energies as being probed in current and upcoming experiments including IceCube, HAWC, CTA, and LHAASO. Our approach improves considerably on existing methods. For example, we include all relevant electroweak interactions. The importance of these effects grow with DM mass, and by an EeV our spectra can differ by orders of magnitude from existing results.

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“…It is crucial that the heavy particles Ψ primarily decay into gravitons, while the decay into the Standard Model is suppressed. Otherwise, the fraction f is constrained to be f 10 −5 -10 −7 (depending on the decay channel) [39] and it would give a negligible contribution to a relic abundance of gravitons (nor would it help with the Hubble tension).…”

Section: Jcap06(2023)019 4 Gravitons From Decaying Dark Mattermentioning

confidence: 99%

“…While the coupling ∼ ΨR does not lead to the decay into a pair of gravitons, it nevertheless triggers the production of (beyond) the Standard Model particles with a rate that is also inversely proportional to the fourth power of the Planck mass [41] and thus can exceed the rate (4.4) in some range of parameters. If this is the case, the constraints on the γ-ray cascade initiated by the decay forces the fraction of superheavy dark matter to be f 10 −5 -10 −7 [39] (in case A) or the dark matter lifetime to exceed the age of the Universe by ∼ 10 orders of magnitude [42] (in case B). In both cases, gravitons are produced with a negligible abundance.…”

Section: Jcap06(2023)019mentioning

confidence: 99%

Shimmering gravitons in the gamma-ray sky

Ramazanov¹,

Samanta²,

Georg³

et al. 2023

J. Cosmol. Astropart. Phys.

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What is the highest energy at which gravitons can be observed? We address this question by studying graviton-to-photon conversion — the inverse-Gertsenshtein effect — in the magnetic field of the Milky Way. We find that above ∼ 1 PeV the effective photon mass grows large enough to quench the conversion rate. For sub-PeV energies, the induced photon flux is comparable to the sensitivity of LHAASO to a diffuse γ-ray background, but only for graviton abundances of order Ωgw h 2 0 ∼ 1. In the future, owing to a better understanding of γ-ray backgrounds, larger effective areas and longer observation times, sub-PeV shimmering gravitons with a realistic abundance of Ωgw h 2 0 ∼ 0.01 could be detected. We show how such a large abundance is achieved in a cosmologically-motivated scenario of post-recombination superheavy dark matter decay. Therefore, the sub-PeV range might be the ultimate energy frontier at which gravitons can be observed.

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Dark matter component decaying after recombination: constraints from diffuse gamma-ray and neutrino flux measurements

Cited by 5 publications

References 36 publications

Dark matter spectra from the electroweak to the Planck scale

Dark matter spectra from the electroweak to the Planck scale

Dark Matter Spectra from the Electroweak to the Planck Scale

Shimmering gravitons in the gamma-ray sky

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