Quantum unitary dynamics of a charged fermionic field and Schwinger effect

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Álvarez Domínguez, Álvaro and Garay Elizondo, Luis Javier and García Heredia, David and Martín Benito, Mercedes (2021) Quantum unitary dynamics of a charged fermionic field and Schwinger effect. Journal of High Energy Physics, 2021 (10). ISSN 1029-8479

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Official URL: https://doi.org/10.1007/JHEP10%282021%29074



Abstract

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.


Item Type:Article
Uncontrolled Keywords:Nonperturbative Effects, Gauge Symmetry
Subjects:Sciences > Physics > Quantum theory
ID Code:74468
Deposited On:09 Sep 2022 14:52
Last Modified:13 Sep 2022 10:41

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