TY - JOUR
T1 - The 7 keV axion dark matter and the X-ray line signal
AU - Higaki, Tetsutaro
AU - Jeong, Kwang Sik
AU - Takahashi, Fuminobu
N1 - Funding Information:
This work was supported by Grant-in-Aid for Scientific Research on Innovative Areas (Nos. 24111702 , 21111006 , and 23104008 ) [FT], Scientific Research (A) (Nos. 22244030 and 21244033 ) [FT], and JSPS Grant-in-Aid for Young Scientists (B) (No. 24740135 [FT] and No. 25800169 [TH]), and Inoue Foundation for Science [FT]. This work was also supported by World Premier International Center Initiative (WPI Program), MEXT , Japan [FT].
PY - 2014/6/2
Y1 - 2014/6/2
N2 - We propose a scenario where the saxion dominates the energy density of the Universe and reheats the standard model sector via the dilatonic coupling, while its axionic partner contributes to dark matter decaying into photons via the same operator in supersymmetry. Interestingly, for the axion mass m a ≃ 7keV and the decay constant f a ≃ 1014-15GeV, the recently discovered X-ray line at 3.5keV in the XMM Newton X-ray observatory data can be explained. We discuss various cosmological aspects of the 7keV axion dark matter such as the production of axion dark matter, the saxion decay process, hot dark matter and isocurvature constraints on the axion dark matter, and the possible baryogenesis scenarios.
AB - We propose a scenario where the saxion dominates the energy density of the Universe and reheats the standard model sector via the dilatonic coupling, while its axionic partner contributes to dark matter decaying into photons via the same operator in supersymmetry. Interestingly, for the axion mass m a ≃ 7keV and the decay constant f a ≃ 1014-15GeV, the recently discovered X-ray line at 3.5keV in the XMM Newton X-ray observatory data can be explained. We discuss various cosmological aspects of the 7keV axion dark matter such as the production of axion dark matter, the saxion decay process, hot dark matter and isocurvature constraints on the axion dark matter, and the possible baryogenesis scenarios.
UR - http://www.scopus.com/inward/record.url?scp=84898930304&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84898930304&partnerID=8YFLogxK
U2 - 10.1016/j.physletb.2014.04.007
DO - 10.1016/j.physletb.2014.04.007
M3 - Article
AN - SCOPUS:84898930304
SN - 0370-2693
VL - 733
SP - 25
EP - 31
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
ER -