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Radiative decays of massive relic particles and the submillimeter backgroundThe interaction of the decay photons of an unstable relic particle species with the microwave background radiation is considered. The radiative decays of these particles delay recombination and serve as an energy source for the resultant plasma. Nonrelativistic Compton scattering by these electrons couples the decay photons to the microwave background, producing submillimeter distortions. If the decay products close the universe, they must decay with a radiative branching ratio larger than 2.5 x 10 to the -5th in order to produce recently observed excess submillimeter background radiation. To be consistent with measurements of the UV background, their mass m is much greater than 114 keV and their decay redshift z is much greater than 5200.
Document ID
Document Type
Reprint (Version printed in journal)
Field, George B.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Walker, Terry P.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Date Acquired
August 14, 2013
Publication Date
July 10, 1989
Publication Information
Publication: Physical Review Letters
Volume: 63
ISSN: 0031-9007
Subject Category
Space Radiation
Accession Number
Distribution Limits

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