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On the superpropagator of fields with exponential coupling

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Abstract

We define the vacuum expectation value of the time-ordered product of two exponentials of free fields as a distribution using minimal singularity as a criterion. The implication of this definition for an exponentially self-coupled scalar field is studied in second order of a perturbation expansion.

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Lehmann, H., Pohlmeyer, K. On the superpropagator of fields with exponential coupling. Commun.Math. Phys. 20, 101–110 (1971). https://doi.org/10.1007/BF01646529

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