TY  - JOUR
AU  - Beltran-Palau, P.
AU  - Ferreiro, A.
AU  - Navarro-Salas, J.
AU  - Pla, S.
PY  - 2019
DA  - 2019//
TI  - Breaking of adiabatic invariance in the creation of particles by electromagnetic backgrounds
T2  - Phys. Rev. D
JO  - Physical Review D
SP  - 085014
EP  - 12pp
VL  - 100
IS  - 8
PB  - Amer Physical Soc
AB  - Particles 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.
SN  - 2470-0010
UR  - https://arxiv.org/abs/1905.07215
UR  - https://doi.org/10.1103/PhysRevD.100.085014
DO  - 10.1103/PhysRevD.100.085014
LA  - English
N1  - WOS:000491467800009
ID  - Beltran-Palau_etal2019
ER  -