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The axino with mass in the GeV region can be cold dark matter (CDM) in the galactic halo. However, if R-parity is broken, for example by the bilinear terms μ α , then axino (a) can decay to ν+γ. In this case, the most stringent bound on the axino lifetime comes from the diffuse photon background and we obtain that the axino lifetime should be greater than 3.9x10 24 Ω a ...
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