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Kaluza-Klein photon in universal extra dimension models is one of the mostattractive dark matter candidates as a weakly interacting massive particle.Having a characteristic split spectrum in split universal extra dimension therelic density of Kaluza-Klein photon with 900 GeV mass is in good agreementwith the observed dark matter amount in our Universe. InterestinglyKaluza-Klein photon in the same mass range also provides excellent fits to therecently observed excesses in cosmic electron and positron fluxes. The amountof gamma-ray contributions, mostly from tau decays, can be significant around300 GeV, thus can be observed or constrained by the forthcoming Fermi-LATdiffuse gamma-ray data.

Kaluza-Klein Dark Matter After Fermi