Anomaly in Canonical Semiclassical Gravity
Phys. Rev. Lett. 137, 031501 – Published 16 July, 2026
DOI: https://doi.org/10.1103/q81l-xfkx
Abstract
We show that the canonical formulation of the semiclassical Einstein equation, where the matter terms in the constraints are replaced by expectation values of the corresponding operators in quantum states, is inconsistent due to the nonclosure of the resulting constraint algebra.
