RT Journal Article T1 Particle production from axial fields A1 López Maroto, Antonio AB We study the production of massive fermions in arbitrary vector and axial-vector classical backgrounds using effective action techniques. A perturbative calculation shows the different features of each field and in particular it is seen that pure temporal axial fields can produce particles whereas it is not possible for a pure vector background. We also analyze from a non-perturbative point of view a particular configuration with constant electric and axial fields and show that the presence of the axial background inhibits the production from the electric field. [S0556-2821(99)04504-X]. PB American Physical Society SN 0556-2821 YR 1999 FD 1999-02-02 LK https://hdl.handle.net/20.500.14352/59336 UL https://hdl.handle.net/20.500.14352/59336 LA eng NO © 1999 The American Physical Society. I thank Ed. Copeland and A. Dobado for useful suggestions. This work has been partially supported by the Ministerio de Educación y Ciencia (Spain) (CICYT AEN96-1634). The author also acknowledges support from SEUID-Royal Society. NO Ministerio de Educación y Ciencia (Spain) NO SEUID-Royal Society DS Docta Complutense RD 30 mar 2026