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oai:docta.ucm.es:20.500.14352/49862023-08-26T00:53:30Zcom_20.500.14352_14col_20.500.14352_15

Quantum unitary dynamics of a charged fermionic field and Schwinger effect Álvarez Domínguez, Álvaro Garay Elizondo, Luis Javier García Heredia, David Martín Benito, Mercedes Nonperturbative Effects Gauge Symmetry Teoría de los quanta 2210.23 Teoría Cuántica In quantum field theory, particle creation occurs, in general, when an intense external field, such as an electromagnetic field, breaks time translational invariance. This leads to an ambiguity in the definition of the vacuum state. In cosmological backgrounds this ambiguity has been reduced by imposing that the quantization preserves the symmetries of the system and that the dynamics is unitarily implemented. In this work, we apply these requirements to the quantization of a massive charged fermionic field coupled to a classical time-dependent homogeneous electric field, extending previous studies done for a scalar field. We characterize the quantizations fulfilling the criteria above and we show that they form a unique equivalence class of unitarily related quantizations, which provide a well-defined number of created particles at all finite times. Ministerio de Ciencia e Innovación (MICINN) IPARCOS Depto. de Física Teórica Fac. de Ciencias Físicas TRUE pub 2023-06-16T14:25:12Z 2023-06-16T14:25:12Z 2021-10-08 journal article https://hdl.handle.net/20.500.14352/4986 1029-8479 10.1007/JHEP10(2021)074 eng FIS2017-86497-C2-2-P, PID2020-118159GB-C44 Ayudas para la realización de Trabajos Fin de Máster del Instituto de Física de Partículas y del Cosmos Atribución 3.0 España https://creativecommons.org/licenses/by/3.0/es/ open access application/pdf Springer