2025/11/11 by Viqar Husain, Irfan Javed, Husain, Viqar +1
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #High Energy Physics - Theory (hep-th) #Noncommutative and Quantum Gravity Theories
paper · doi:10.48550/arxiv.2511.07753
openalex publication_date 2025/11/11 · openalex created_date 2025/11/13 · openalex updated_date 2026/08/03
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.