Mikhail Petrov

Sharp scalar positivity in two-coupling postquantum classical gravity: de Sitter classification, FLRW stability, and a calibration-free covariance test

A covariant postquantum classical-gravity path integral uses a two-coupling generalized DeWitt kernel to suppress departures from Einstein's equation. Retaining the cosmological term already present in the covariant action, this preprint classifies the complete Newtonian-gauge sc...

Sharp scalar positivity in two-coupling postquantum classical gravity: de Sitter classification, FLRW stability, and a calibration-free covariance test

A covariant postquantum classical-gravity path integral uses a two-coupling generalized DeWitt kernel to suppress departures from Einstein's equation. Retaining the cosmological term already present in the covariant action, this preprint classifies the complete Newtonian-gauge sc...

A physical transverse-current sign obstruction in a full-tensor postquantum classical gravity action

This preprint identifies a physical transverse-current sign obstruction in the static full-tensor Feynman–Vernon quadratic form displayed in a linearised two-coupling postquantum classical gravity model. A difference of two separately conserved positive-energy pressureless-dust b...