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Breaking of adiabatic invariance in the creation of particles by electromagnetic backgrounds

AuthorsBeltrán-Palau, P.; Ferreiro, Antonio; Navarro-Salas, José ; Pla, S.
Issue DateOct-2019
CitationPhysical Review D 100 8: 085014 (2019)
AbstractParticles are spontaneously created from the vacuum by time-varying gravitational or electromagnetic backgrounds. It has been proven that the particle number operator in an expanding universe is an adiabatic invariant. In this paper we show that, in some special cases, the expected adiabatic invariance of the particle number fails in presence of electromagnetic backgrounds. In order to do this, we consider as a prototype a Sauter-type electric pulse. Furthermore, we also show a close relation between the breaking of the adiabatic invariance and the emergence of the axial anomaly.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevD.100.085014
Identifiersdoi: 10.1103/PhysRevD.100.085014
issn: 2470-0029
Appears in Collections:(IFIC) Artículos
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