Journal
PHYSICAL REVIEW D
Volume 99, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.99.123510
Keywords
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Funding
- Science and Engineering Research Board, Department of Science and Technology, Govt. of India [ECR/2015/000078]
- Max Planck Partner Group - Max-Planck-Gesellschaft
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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 mu-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.
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