Abstract
The mathematical formalism commonly used in treating nonlocal highly singular interactions is revised. The notion of a support cone is introduced, which replaces that of support for nonlocalizable distributions. Such support cones are proven to exist for distributions defined on the Gelfand-Shilov spaces Sβ, where 0<β<1. This result leads to a refinement of previous generalizations of the local commutativity condition to nonlocal quantum fields. For string propagators, a new derivation of a representation similar to that of Källen-Lehmann is proposed. It is applicable to any initial and final string configurations and manifests exponential growth of spectral densities intrinsic in nonlocalizable theories.
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In memory of Michael Polivanov, the remarkable personality and scientist
Department of Theoretical Physics, P. N. Lebedev Physical Institute. E-mail: theordep@sci.fian.msk.su. Published in Teoreticheskaya i Matematicheskaya Fizika, Vol. 93, No. 3, pp. 514–528, December, 1992.
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Fainberg, V.Y., Soloviev, M.A. Nonlocalizability and asymptotical commutativity. Theor Math Phys 93, 1438–1449 (1992). https://doi.org/10.1007/BF01016400
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DOI: https://doi.org/10.1007/BF01016400