  The lightest Kaluza-Klein particle (LKP) in models with universal extra
dimensions is an interesting dark matter candidate that has recently received
great attention. Here, we investigate the antiproton flux from LKP
annihilations in the galactic halo. In our analysis we include different halo
density profiles and allow for part of the dark matter to be concentrated in
'clumps' rather than being distributed homogeneously. After re-analyzing the
observational bounds on the allowed amount of clumpiness, we find that LKP
annihilations may well give a significant contribution to the antiproton flux
at energies higher than about 10 GeV, while for energies above around 500 GeV
the conventional background is expected to dominate again. The shortly upcoming
PAMELA satellite will already be able to measure part of this high-energy
window, while planned experiments like AMS-02 will have access to the full
energy range of interest.
