TY - JOUR
T1 - Gravitino/axino as decaying dark matter and cosmological tensions
AU - Hamaguchi, Koichi
AU - Nakayama, Kazunori
AU - Tang, Yong
N1 - Funding Information:
This work was supported by the Grant-in-Aid for Scientific Research on Scientific Research A (No. 26247038 [KH], No. 26247042 [KN], No. 16H02189 [KH]), Young Scientists B (No. 26800121 [KN], No. 26800123 [KH]) and Innovative Areas (No. 26104001 [KH], No. 26104009 [KH and KN], No. 15H05888 [KN], No. 16H06490 [YT]), and by World Premier International Research Center Initiative (WPI Initiative), MEXT , Japan.
Publisher Copyright:
© 2017 The Author(s)
PY - 2017/9/10
Y1 - 2017/9/10
N2 - In supersymmetric axion models, if the gravitino or axino is the lightest SUSY particle (LSP), the other is often the next-to-LSP (NLSP). We investigate the cosmology of such a scenario and point out that the lifetime of the NLSP naturally becomes comparable to the present age of the universe in a viable parameter region. This is a well-motivated example of the so-called decaying dark matter model, which is recently considered as an extension of the ΛCDM model to relax some cosmological tensions.
AB - In supersymmetric axion models, if the gravitino or axino is the lightest SUSY particle (LSP), the other is often the next-to-LSP (NLSP). We investigate the cosmology of such a scenario and point out that the lifetime of the NLSP naturally becomes comparable to the present age of the universe in a viable parameter region. This is a well-motivated example of the so-called decaying dark matter model, which is recently considered as an extension of the ΛCDM model to relax some cosmological tensions.
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U2 - 10.1016/j.physletb.2017.06.071
DO - 10.1016/j.physletb.2017.06.071
M3 - Article
AN - SCOPUS:85030451004
SN - 0370-2693
VL - 772
SP - 415
EP - 419
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 -