# 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**

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**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.`

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