Re: Kaluza Klein fermions

Thanks for the references.

Here's another question on KK theory, which is only somewhat related. 
Consider the simplest possible spacetime manifold with one
compactified dimension, that is, R^2xS.  Since one of the R dimensions
is time our spatial manifold is RxS.  Now, we want to extract physics
that look like R plus some matter by dimensional reduction.  However,
if we consider a photon source in RxS, it is clear that at a single
point some distance away, the intensity of light will be
infinitesimal, while in R the intensity will be (1/2)(total intensity
of source).  Even if we expand the point to some small area in RxS,
the total intensity is still less than what we would expect in R.  The
only solution to this problem that I can see is to say that particles
must be manifestations of standing waves on the compactified
dimension.  Am I correct in assuming this?  Otherwise, it seems like
we won't get the correct intensity decay formula when we reduce
dimensions.
I'm sorry if this is a really stupid question (which is probably is!) 
I've just started looking into KK theories.