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Indefinite Metric and Stationary External Interactions of Quantized Fields
Phys. Rev. D 2, 2938 – Published 15 December, 1970
DOI: https://doi.org/10.1103/PhysRevD.2.2938
Abstract
We discuss the necessary modifications of the state space for quantum fields interacting with strong stationary external fields. In addition to the introduction of an indefinite metric, we discuss the possibility of having a positive-definite metric without a vacuum state.
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