Generalized Invariants and Quantum Evolution of Open Fermionic System
arXiv:hep-th/9910189 · doi:10.1016/S0375-9601(00)00406-0
Abstract
Open systems acquire time-dependent coupling constants through interaction with an external field or environment. We generalize the Lewis-Riesenfeld invariant theorem to open system of quantum fields after second quantization. The generalized invariants and thereby the quantum evolution are found explicitly for time-dependent quadratic fermionic systems. The pair production of fermions is computed and other physical implications are discussed.
LaTex, 10 pages, no figures; replaced by the version to be published in Phys. Lett. A; the validity of the Liouville-von Neumann approach is clarified for non-normalizable and degenerate states; references added
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Cited by in corpus (13)
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