A candidate mechanism remains external

Asymptotic safety is one possible candidate mechanism. The gravitational flow framework and fixed-point programme of Reuter and Reuter–Saueressig are external ReuterFlow,ReuterSaueressig. They do not verify an Enter sheet or construct the present relational insertion.

An exact candidate theory space must include or justify excluding operators generated by its flow. Keeping Einstein–scalar field content does not mean retaining only the Einstein–Hilbert and scalar quadratic action terms. Higher-curvature, matter, vacuum, and insertion terms require a declared treatment.

For an exact essential-coupling flow, write

Redundant directions must be identified before essential physical inputs are counted.