TY - JOUR
T1 - The 3.5 keV X-ray line signal from decaying moduli with low cutoff scale
AU - Nakayama, Kazunori
AU - Takahashi, Fuminobu
AU - Yanagida, Tsutomu T.
N1 - Funding Information:
This work was supported by the Grant-in-Aid for Scientific Research on Innovative Areas (No. 21111006 [KN and FT], No. 23104008 [FT], No. 24111702 [FT]), Scientific Research (A) (No. 22244030 [KN and FT], 21244033 [FT], 22244021 [TTY]), JSPS Grant-in-Aid for Young Scientists (B) (No. 24740135 ) [FT], and Inoue Foundation for Science [FT]. This work was also supported by World Premier International Center Initiative (WPI Program), MEXT , Japan.
PY - 2014/7/30
Y1 - 2014/7/30
N2 - The recent unidentified 3.5 keV X-ray line signal can be explained by decaying moduli dark matter with a cutoff scale one order of magnitude smaller than the Planck scale. We show that such modulus field with the low cutoff scale follows a time-dependent potential minimum and its abundance is reduced by the adiabatic suppression mechanism. As a result the modulus abundance can naturally be consistent with the observed dark matter abundance without any fine-tuning of the initial oscillation amplitude.
AB - The recent unidentified 3.5 keV X-ray line signal can be explained by decaying moduli dark matter with a cutoff scale one order of magnitude smaller than the Planck scale. We show that such modulus field with the low cutoff scale follows a time-dependent potential minimum and its abundance is reduced by the adiabatic suppression mechanism. As a result the modulus abundance can naturally be consistent with the observed dark matter abundance without any fine-tuning of the initial oscillation amplitude.
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U2 - 10.1016/j.physletb.2014.06.061
DO - 10.1016/j.physletb.2014.06.061
M3 - Article
AN - SCOPUS:84903767463
SN - 0370-2693
VL - 735
SP - 338
EP - 339
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 -