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metadata.rede.dc.title: A note on infraparticles and unparticles Schroer, Bert
metadata.rede.dc.contributor.author1: Centro Brasileiro de Pesquisas Físicas (CBPF)
metadata.rede.dc.publisher: Centro Brasileiro de Pesquisas Físicas 2008
metadata.rede.dc.description.resumo: 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 which dissolves the mass-shell in an inexorable way into the continuum and therefore renders the standard particle concept useless. These objects were recently rediscovered under the name unparticles The case of infraparticles also encompasses particle-like objects in conformal QFT when all multiparticle thresholds coalesce on top of each other and only the concept of a highly inclusive cross section survives of scattering theory. The infraparticle research has led to deep results and the recently discovered semiinfinite string-localized vectorpotentials have led to new interesting ideas of dealing with physical electrically charged states and a generalized scattering theory. We explain why unparticles are identical to the old infraparticles. Using this relation it is shown that unparticles/infraparticles cannot lead to a natural description of darkness of dark matter. A more radical scenario for darkness comes from semiinfinite string-localized vectorpotentials in a reformulated version of nonabelian gauge theory.
metadata.rede.dc.subject: Rede Nacional de Física de Altas Energias – RENAFAE
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