New CMB spectral distortion constraints on decaying dark matter with full evolution of electromagnetic cascades before recombination

Current constraints on energy injection in the form of energetic particles before the epoch of recombination using CMB spectral distortions assume that all energy goes into y and μ-type distortions. We revisit these constraints with exact calculations of the spectral distortions by evolving the elec...

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Bibliographic Details
Published in:Physical review. D 2019-06, Vol.99 (12), p.1, Article 123510
Main Authors: Acharya, Sandeep Kumar, Khatri, Rishi
Format: Article
Language:English
Subjects:
Cascades
Dark matter
Distortion
Energetic particles
Spectra
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Summary:Current constraints on energy injection in the form of energetic particles before the epoch of recombination using CMB spectral distortions assume that all energy goes into y and μ-type distortions. We revisit these constraints with exact calculations of the spectral distortions by evolving the electromagnetic cascades. The actual spectral distortion differs in shape and amplitude from the y-type distortion and depends on the energy and nature of injected particles. The constraints on the energy injection processes such as dark matter decay can be relaxed by as much as a factor of 5.
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.99.123510