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Seminário do Grupo de Física Teórica

Sala:201

Horário: 15hs

Palestrante: Marcelo Guimarães - UERJ

Título: Confinement and i-particles

Resumo: A confining mechanism based on the BRST symmetry breaking is discussed. The proper identification of the confined unphysical excitations, here called i-particles, shows to be a important step in the construction of the physical spectrum. These i-particles can be identified with the confined gluons of the BRST symmetry breaking Gribov-Zwanziger theory. We introduce a simple toy model describing how a suitable set of composite operators can be constructed out of i-particles whose correlation functions exhibit only real branch cuts, with associated positive spectral density. These composite operators can thus be called physical and are the toy analogy of glueballs in the Gribov-Zwanziger theory.