  There are reasons (which we enumerate) to think that an infinite extra
dimension will harbor a black hole. In this case, brane-localized modes of
gravity and gauge fields become quasilocalized, and light from a distant object
can become extinct as it is lost to the black hole. In a concrete scenario,
where the photon is localized by gravity, we find that the extinction rate for
propagating photons is at least comparable to the correction to the real part
of the frequency. That results, for example, in a stringent bound on
renormalization of the speed of light.
