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- W3103187879 abstract "We show how the exact renormalization group for the effective action with a sharp momentum cutoff, may be organized by expanding one-particle irreducible parts in terms of homogeneous functions of momenta of integer degree (Taylor expansions not being possible). A systematic series of approximations - the O(pM) approximations - result from discarding from these parts, all terms of higher than the Mth degree. These approximations preserve a field reparametrization invariance, ensuring that the field's anomalous dimension is unambiguously determined. The lowest order approximation coincides with the local potential approximation to the Wegner-Houghton equations. We discuss the practical difficulties with extending the approximation beyond O(p0)." @default.
- W3103187879 created "2020-11-23" @default.
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- W3103187879 date "1996-01-01" @default.
- W3103187879 modified "2023-10-16" @default.
- W3103187879 title "Momentum scale expansion of sharp cutoff flow equations" @default.
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- W3103187879 doi "https://doi.org/10.1016/0550-3213(95)00541-2" @default.
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