150272 20251017144635.0 doi 10.1016/j.physletb.2005.04.044 sideral 55949 ART-2005-55949 eng Cortes, J.L. Universidad de Zaragoza (orcid)0000-0002-8282-3435 An adiabatic approximation to the path integral for relativistic fermionic fields 2005 Access copy available to the general public Unrestricted A new approach to the path integral over fermionic fields, based on the extension of a reformulation of the adiabatic approximation to some quantum-mechanical systems, is presented. A novel non-analytic contribution to the effective fermionic action for a fermion field coupled to a non-Abelian vector field is identified. The possible interpretation of this contribution as a violation of the decoupling theorem in quantum field theory (QFT) is discussed. The generalization of the approach to the case of finite temperature and density suggests the possibility to apply it to the understanding of non-perturbative properties in QFT and their dependence on temperature and density. info:eu-repo/grantAgreement/ES/MCYT/FPA2003-02948 info:eu-repo/semantics/openAccess by https://creativecommons.org/licenses/by/4.0/deed.es 5.301 2005 PHYSICS, MULTIDISCIPLINARY 6 / 68 = 0.088 2005 Q1 T1 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Gamboa, J. Lepe, S. Lopez Sarrion, J. (orcid)0000-0002-2868-194X 2004 405 Universidad de Zaragoza Dpto. Física Teórica Área Física Teórica 619, 3-4 (2005), 367-376 Phys. lett., Sect. B Physics Letters B 0370-2693 134444 http://zaguan.unizar.es/record/150272/files/texto_completo.pdf Versión publicada 1557865 http://zaguan.unizar.es/record/150272/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:150272 articulos driver 2025-10-17-14:28:34 ARTICLE