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Colder freeze-in axinos decaying into photons

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Title
Colder freeze-in axinos decaying into photons
Author(s)
Kyu Jung Bae; Ayuki Kamada; Seng Pei Liew; Keisuke Yanagi
Publication Date
2018-03
Journal
PHYSICAL REVIEW D, v.97, no.5, pp.055019 -
Publisher
American Physical Society
Abstract
We point out that 7 keV axino dark matter (DM) in the R-parity violating (RPV) supersymmetric (SUSY) Dine-Fischler-Srednicki-Zhitnitsky axion model can simultaneously reproduce the 3.5 keV x-ray line excess and evade stringent constraints from the Ly-α forest data. Peccei-Quinn symmetry breaking naturally generates both the TeV-scale μ term and the MeV-scale RPV term. The RPV term introduces a tiny axino-neutrino mixing and provides axino DM as a variant of the sterile neutrino DM explaining the 3.5 keV x-ray line excess. Axinos are produced by freeze-in processes via the μ term. The resultant phase space distribution tends to be colder than the Fermi-Dirac distribution. The inherent entropy production from late-time saxion decay makes axinos even colder than those without saxion decay. The resultant axino DM takes the correct relic density and is compatible even with the latest and strongest constraint from the Ly-α forest data. © 2018 authors
URI
http://pr.ibs.re.kr/handle/8788114/4610
DOI
10.1103/PhysRevD.97.056026
ISSN
2470-0010
Appears in Collections:
Center for Fundamental Theory(순수물리이론 연구단) > Journal Papers (저널논문)
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