Badly Behaving Photons & Spacetime as 4-surface

Abstract

Photons in a hollow helical and conical light beam are found to behave as if they had spin 1/2. The proposed explanation is in terms of additional angular momentum like operator performing rotations around the symmetry axis of the helical beam acting as symmetries. The problem is that the definition of this operator however depends on the photon state.  There are two kinds of rotations and in TGD framework the interpretation would be in terms of rotations of imbedding space on one hand and rotations at space-time surface assignable to the beam. In recent case this surface could be regarded as a 2-fold covering of Minkowski space. It seems possible to reproduce the experimental findings. Also n-fold coverings with 1/n spin fractionization are predicted to be possible. There is also a connection with h_eff = n x h hypothesis.