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Complex Couplings in Renormalization

F. Gegeny,S. Nagy

INTERNATIONAL JOURNAL OF MODERN PHYSICS A（2022）

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Abstract
The functional renormalization group equations are derived in Minkowski space–time for scalar models. It is shown that the couplings become complex, which can change the fixed point structure. New phases appear, and the models can build up complex fixed points.
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Key words
O(1) model,functional renormalization group,effective average action
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