Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2007-03-21
Phys.Lett.B649:454-462,2007
Physics
High Energy Physics
High Energy Physics - Theory
LaTeX, 13 pages, no figures
Scientific paper
10.1016/j.physletb.2007.04.039
The soft breaking of gauge or other symmetries is the typical Quantum Field Theory phenomenon. In many cases one can apply the St$\ddot{\rm u}$ckelberg procedure, which means introducing some additional field or fields and restore the gauge symmetry. The original softly broken theory corresponds to a particular choice of the gauge fixing condition. In this paper we use this scheme for performing quantum calculations for some softly broken gauge theories in an arbitrary curved space-time. The following examples are treated in details: Proca field, massive QED and massive torsion coupled to fermion. Furthermore we present a qualitative discussions of the discontinuity of quantum effects in the massive spin-2 field theory, paying special attention to the similarity and differences with the massless limit in the spin-1 case.
Berredo-Peixoto Guilherme de
Buchbinder Ioseph L.
Shapiro Ilya L.
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