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- W2952806362 abstract "We study the causality violation in the non-local quantum field theory (as formulated by Kleppe and Woodard) containing a finite mass scale $Lambda $. We use $phi ^{4}$ theory as a simple model for study. Starting from the Bogoliubov-Shirkov criterion for causality, we construct and study combinations of S-matrix elements that signal violation of causality in the one loop approximation. We find that the causality violation in the exclusive process $phi +phi to phi +phi $ grows with energy, but the growth with energy, (for low to moderate energies) is suppressed to all orders compared to what one would expect purely from dimensional considerations. We however find that the causality violation in other processes such as $phi +phi to phi +phi +phi +phi $ grows with energy as expected from dimensional considerations at low to moderate energies. For high enough energies comparable to the mass scale $Lambda $, however, we find a rapid (exponential-like) growth in the degree of causality violation. We generalize some of the 1-loop results to all orders. We present interpretations of the results based on possible interpretations of the non-local quantum field theory models." @default.
- W2952806362 created "2019-06-27" @default.
- W2952806362 creator A5066309159 @default.
- W2952806362 date "2005-12-31" @default.
- W2952806362 modified "2023-09-27" @default.
- W2952806362 title "Causality Violation in Non-local QFT" @default.
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- W2952806362 hasPublicationYear "2005" @default.
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