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We study the photon axion mixing in the presence of large extra dimensions.The eigenvalues and eigenstates of the mixing matrix are analyzed and weestablish the resonance condition for the total conversion of a high energyphoton into a Kaluza-Klein (KK) axion state. This resonant transition, a photontransformed into a KK axion travelling freely through the bulk and convertingback into a photon, may provide a plausible explanation for the transparency ofthe universe to energetic photons. If the brane we live in is curved, thenthere are shortcuts through the bulk, which the axion can take. Within ourmodel, the photons having the appropriate resonance energy are using theaxionic shortcut and arrive earlier compared to the photons which follow thegeodesic on the brane. We suggest that such axionic shortcuts are at the rootof the dispersion of time arrival of photons observed by the MAGIC telescope.We indicate also the cosmological significance of the existence of axionicshortcuts for the photon.

Axionic shortcuts for high energy photons