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The quest for finding self-consistent background solutions in quantum fieldtheory is closely related to the way one decides to set the renormalizationscale $k$. This freedom in the choice of the scale setting can lead toambiguities and conceptual inconsistencies such as the non-conservation of thestress-energy tensor. In this paper a setting for the "scale-field" is proposedat the level of effective action, which avoids such inconsistencies byconstruction. The mechanism and its potential is exemplified for scalar$\phi^4$ theory and for Einstein-Hilbert-Maxwell theory.

Scale Setting for Self-consistent Backgrounds