Search for sharp and smooth spectral signatures of μνSSM gravitino dark matter with Fermi-LAT
Search for sharp and smooth spectral signatures of μνSSM gravitino dark matter with Fermi-LAT
复制标题
使用 Fermi-LAT 搜索 μνSSM 引力暗物质的清晰且平滑的光谱特征
DOI:
10.1088/1475-7516/2017/03/047
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发表时间:
2016
影响因子:
6.4
通讯作者:
R. R. de Austri
中科院分区:
文献类型:
--
作者:
G. Gómez;D. López;C. Muñoz;A. D. Perez;R. R. de Austri
The μνSSM solves the μ problem of supersymmetric models and reproduces neutrino data, simply using couplings with right-handed neutrinos ν's. Given that these couplings break explicitly R parity, the gravitino is a natural candidate for decaying dark matter in the μνSSM. In this work we carry out a complete analysis of the detection of μνSSM gravitino dark matter through γ-ray observations. In addition to the two-body decay producing a sharp line, we include in the analysis the three-body decays producing a smooth spectral signature. We perform first a deep exploration of the low-energy parameter space of the μνSSM taking into account that neutrino data must be reproduced. Then, we compare the γ-ray fluxes predicted by the model with Fermi-LAT observations. In particular, with the 95% CL upper limits on the total diffuse extragalactic γ-ray background using 50 months of data, together with the upper limits on line emission from an updated analysis using 69.9 months of data. For standard values of bino and wino masses, gravitinos with masses larger than about 4 GeV, or lifetimes smaller than about 1028 s, produce too large fluxes and are excluded as dark matter candidates. However, when limiting scenarios with large and close values of the gaugino masses are considered, the constraints turn out to be less stringent, excluding masses larger than 17 GeV and lifetimes smaller than 4 × 1025 s.
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影响因子:
4.9
作者:
Ackermann, M.;Ajello, M.;Zimmer, S.
通讯作者:
Zimmer, S.
影响因子:
5.4
作者:
W. Buchmuller;L. Covi;K. Hamaguchi;A. Ibarra;T. Yanagida
通讯作者:
W. Buchmuller;L. Covi;K. Hamaguchi;A. Ibarra;T. Yanagida
影响因子:
4.9
作者:
Ackermann;M;et al
通讯作者:
et al
DOI:
--
发表时间:
2011
期刊:
影响因子:
--
作者:
Yoshiyuki Inoue;Tomonori Totani;井上芳幸;井上芳幸;井上芳幸;井上芳幸;井上芳幸;井上芳幸;井上芳幸;井上芳幸
通讯作者:
井上芳幸