130 GeV Fermi gamma-ray line from dark matter decay

The 130 GeV gamma-ray line based on tentative analyses on the Fermi-LAT data is hard to be understood with dark matter annihilation in the conventional framework of the MSSM. We point out that it can be nicely explained with two body decay of a scalar dark matter ((phi) over tilde -> gamma gamma) by the dimension 6 operator suppressed with the mass of the grand unification scale (similar to 10(16) GeV), L superset of vertical bar(phi) over tilde (DM)vertical bar(2) F mu nu F mu nu/M-GUT(2), in which the scalar dark matter (phi) over tilde (DM) develops a TeV scale vacuum expectation value. We propose a viable model explaining the 130 GeV gamma-ray line. (C) 2012 Elsevier B.V. All rights reserved.