A note on Infraparticles and Unparticles

Schroer, Bert

We remind the reader of the meaning and achievements of infraparticles which, although themselves not necessarily of zero mass, require the presence of zero mass in order get delocalized states with a singularity at the mass shell which is amalgamated with the continuum. These objects were recently rediscovered under the name unparticles pointing to their not being usual Wigner particles. The case of infraparticles also encompasses particle-like objects in conformal QFT when all multiparticle thresholds coalesce on top of each other. The infraparticle research has led to deep results and the recently discovered string-localized vector potentials have led to new interesting aspects of the infraparticle problem which are presently being investigated.

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jh, Last modified: Fr 25. Apr 12:03:31 CEST 2008