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The lightest Kaluza-Klein particle (LKP), which appears in the theory of universal extra dimensions, is one of the good candidates for cold dark matter. We assume the LKP mass is in the range from 500 GeV to 1000 GeV, and focus on the LKP annihilation modes which contain gamma– rays as final products. The gamma–ray spectrum from LKP annihilation has a characteristic peak structure near the LKP mass (“ line”) from two–body decays and continuum emission extending to lower energies. Gamma rays do not lose energy during propagation after production near the galactic center where dark matter concentration is expected, so we can treat it easier than electron. We investigate the detectability of the peak structure by considering energy resolution of near–future detector, and calculate the expected count spectrum of the gamma–ray signal. The observed gamma–ray spectrum will show the peak clearly, if the LKP mass is heavier. In contrast, if the LKP mass is light, constraint for the boost factor should come from the abundant continuum emission. Detecting such peak structure would be conclusive evidence that dark matter is made of LKP.

The observability of gamma-ray spectral features from Kaluza-Klein dark matter annihilation