Conclusion
The form of causality used in present-day theory follows from basic space-time concepts.
It has been borrowed from macroscopic physics and, in view of the nature of the singularities in the Green's functions, it is carried over automatically to infinitely small scales. This leads to divergencies (infinities) in a number of the more important physical quantities associated with elementary particles.
In this paper we have discussed some of the preliminary theoretical schemes which, while retaining macroscopic causality, produce substantial changes in causality for small space-time scales.
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Translated from Atomnaya Énergiya, Vol. 14, No. 1, pp. 105–109, January, 1963
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Blokhintsev, D.I. Causality in present-day field theory. At Energy 14, 97–101 (1963). https://doi.org/10.1007/BF01126607
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DOI: https://doi.org/10.1007/BF01126607