TY  - JOUR
AU  - Navarro-Salas, J.
AU  - Pla, S.
PY  - 2022
DA  - 2022//
TI  - Particle Creation and the Schwinger Model
T2  - Symmetry-Basel
JO  - Symmetry-Basel
SP  - 2435
EP  - 9pp
VL  - 14
IS  - 11
PB  - Mdpi
KW  - Schwinger model
KW  - semiclassical theory
KW  - particle creation
AB  - We study the particle creation process in the Schwinger model coupled with an external classical source. One can approach the problem by taking advantage of the fact that the full quantized model is solvable and equivalent to a (massive) gauge field with a non-local effective action. Alternatively, one can also face the problem by following the standard semiclassical route. This means quantizing the massless Dirac field and considering the electromagnetic field as a classical background. We evaluate the energy created by a generic, homogeneous, and time-dependent source. The results match exactly in both approaches. This proves in a very direct and economical way the validity of the semiclassical approach for the (massless) Schwinger model, in agreement with a previous analysis based on the linear response equation. Our discussion suggests that a similar analysis for the massive Schwinger model could be used as a non-trivial laboratory to confront a fully quantized solvable model with its semiclassical approximation, therefore mimicking the long-standing confrontation of quantum gravity with quantum field theory in curved spacetime.
UR  - https://arxiv.org/abs/2211.10414
UR  - https://doi.org/10.3390/sym14112435
DO  - 10.3390/sym14112435
LA  - English
N1  - WOS:000895122100001
ID  - Navarro-Salas+Pla2022
ER  -