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We prove the unitarity of the Euclidean nonlocal scalar field theory to all perturbative orders in the loop expansion.
P. M. Lavrov and I. L. Shapiro, arXiv:1902.04687 [hep-th]
1902
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2012
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M. Christodoulou, L. Modesto, Reflection positivity in nonlocal gravity
2018
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