We investigate prospects for indirect detection of Kaluza--Klein dark matter, focusing on the annihilation radiation of the first Kaluza--Klein excitation of the Hypercharge gauge boson $B^{ (1)}$ in the Galactic halo, in particular we estimate neutrino, gamma-ray and synchrotron fluxes. Comparing the predicted fluxes with observational data we are able to constrain the $B^{ (1)}$ mass (and therefore the compactification scale). The constraints depend on the specific model adopted for the dark matter density profile. For a NFW profile the analysis of synchrotron radiation puts a lower bound on the $B^{ (1)}$ mass of the order of $\simeq 300$ GeV.
Categories: hep-ph astro-ph