Search for 100 MeV to 10 GeV γ-ray lines in the Fermi-LAT data and implications for gravitino dark matter in the μνSSM

被引:63
作者
Albert, Andrea [1 ,2 ]
Gomez-Vargas, German A. [3 ,4 ,5 ,6 ]
Grefe, Michael [3 ,4 ,7 ]
Munoz, Carlos [3 ,4 ]
Weniger, Christoph [8 ]
Bloom, Elliott D. [1 ,2 ]
Charles, Eric [1 ,2 ]
Mazziotta, Mario N. [9 ]
Morselli, Aldo [6 ]
机构
[1] Stanford Univ, Kavli Inst Particle Astrophys & Cosmol, Dept Phys, WW Hansen Expt Phys Lab, Stanford, CA 94305 USA
[2] Stanford Univ, SLAC Natl Accelerator Lab, Stanford, CA 94305 USA
[3] Univ Autonoma Madrid, Inst Fis Teor, CSIC, E-28049 Madrid, Spain
[4] Univ Autonoma Madrid, Dept Fis Teor, E-28049 Madrid, Spain
[5] Pontificia Univ Catolica Chile, Dept Fis, Santiago, Chile
[6] Ist Nazl Fis Nucl, Sez Roma Tor Vergata, I-00133 Rome, Italy
[7] Univ Hamburg, Inst Theoret Phys 2, D-22761 Hamburg, Germany
[8] Univ Amsterdam, GRAPPA, NL-1098 XH Amsterdam, Netherlands
[9] Ist Nazl Fis Nucl, Sez Bari, I-70126 Bari, Italy
来源
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2014年 / 10期
关键词
gamma ray experiments; dark matter experiments; dark matter theory; gamma ray theory; REHEATING TEMPERATURE; BLACK-HOLE; CANDIDATES; PARTICLE; DENSITY; PHYSICS; DECAYS; MODELS; LIGHT;
D O I
10.1088/1475-7516/2014/10/023
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Dark matter decay or annihilation may produce monochromatic signals in the gamma-ray energy range. In this work we argue that there are strong theoretical motivations for studying these signals in the framework of gravitino dark matter decay and we perform a search for gamma-ray spectral lines from 100 MeV to 10 GeV with Fermi-LAT data. In contrast to previous line searches at higher energies, the sensitivity of the present search is dominated by systematic uncertainties across most of the energy range considered. We estimate the size of systematic effects by analysing the flux from a number of control regions, and include the systematic uncertainties consistently in our fitting procedure. We have not observed any significant signals and present model-independent limits on gamma-ray line emission from decaying and annihilating dark matter. We apply the former limits to the case of the gravitino, a well-known dark matter candidate in supersymmetric scenarios. In particular, the R-parity violating "mu from nu" Supersymmetric Standard Model (mu nu SSM) is an attractive scenario in which including right-handed neutrinos solves the mu problem of the Minimal Supersymmetric Standard Model while simultaneously explaining the origin of neutrino masses. At the same time, the violation of R-parity renders the gravitino unstable and subject to decay into a photon and a neutrino. As a consequence of the limits on line emission, mu nu SSM gravitinos with masses larger than about 5 GeV, or lifetimes smaller than about 10(28) s, are excluded at 95% confidence level as dark matter candidates.
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页数:31
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