Speaker
Alberto Ibort
Description
Abstract:
A symmetry based notion of elementary particles on curved space-times is presented where the Poincaré group of Minkowski space-time is replaced by a canonical groupoid. The irreducible projective representations of such groupoid, called the Wigner groupoid of the given space-time, provide a natural notion of elementary particles valid on any space-time. The computation of such representations for a large class of space-times recovers Wigner’s original classification of elementary particles on flat space-time with a surprise: there is a new family of representations parametrized by magnetic momentum like quantity.