Nuclear Physics B (Jun 2018)

Gauge-invariant flow equation

  • C. Wetterich

DOI
https://doi.org/10.1016/j.nuclphysb.2018.04.020
Journal volume & issue
Vol. 931, no. C
pp. 262 – 282

Abstract

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We propose a closed gauge-invariant functional flow equation for Yang–Mills theories and quantum gravity that only involves one macroscopic gauge field or metric. It is based on a projection on physical and gauge fluctuations. Deriving this equation from a functional integral we employ the freedom in the precise choice of the macroscopic field and the effective average action in order to realize a closed and simple form of the flow equation.