Global harmonic analysis for ${\mathrm{\Phi }}_3^4$ on closed Riemannian manifolds

Following Parisi & Wu’s paradigm of stochastic quantization, we constructed in \cite{BDFT} a ${\mathrm{\Phi }}^4$ measure on an arbitrary closed, compact Riemannian manifold of dimension $3$ as an invariant measure of a singular stochastic partial differential equation. This solves a longstanding open problem in quantum fields on curved backgrounds. In the present work, we build all the harmonic and microlocal analysis tools that are needed in \cite{BDFT}. In particular, we extend the approach of Jagannath–Perkowski to the vectorial ${\mathrm{\Phi }}_3^4$ model by introducing a new Cole-Hopf transform involving random bundle maps.