Speaker
Prof.
Norbert Dragon
(Leibniz Universität Hannover)
Description
We present the unitary representation of the Poincaré group on massless states of arbitrary helicity and construct a conserved current. Such a current seemed to be excluded by arguments of Witten and Weinberg. Taking into account the nontriviality of the Hopf bundle we clarify and correct their statements and other folklore.
