SEMINAR

Massive Yang-Mills Theory: a mechanism based on nonlinearly realized gauge symmetry

Prof. Ruggero Ferrari

(Universitá Milano, Italia)

Sala P7, IST, Edifício Matemática
Tuesday, September 18th, 2007 at 04:00 PM

Abstract

A massive Yang-Mills theory is formulated via a nonlinear sigma model auxiliary field and Faddeev-Popov ghosts. Two equations are used in order to perform a symmetric subtraction of the divergences: Slavnov-Taylor identity and a local functional equation associated to the local gauge symmetry. The theory is stable under the introduction of counterterms. Physical unitarity is preserved.