Abstract
European Centre for Theoretical Studies in Nuclear Physics and Related Areas (ECT*),and Fondazione Bruno Kessler,Villa Tambosi, Strada delle Tabarelle 286, I-38123 Villazzano (TN) Italy.E-mail:binosi@ectstar.euWe review our most recent results in formulating gauge theories in the presence of a backgroundfield on the basis of symmetry arguments only. In particular w e show how one can gain fullcontrol over the dependenceon the backgroundfield of the eff ective action, and how the so-calledbackground field method emerges naturally from the requirem ent of invariance under the BRSTand antiBRST symmetries.QCD-TNT-III-From quarks and gluons to hadronic matter: A bridge too far?,2-6 September, 2013European Centre for Theoretical Studies in Nuclear Physics and Related Areas (ECT*), Villazzano, Trento(Italy)
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