A Feynman-Kac Formula for the Subcritical Ultraviolet-Renormalized Spin Boson Model

Daniel M. Fröhlich, Benjamin Hinrichs

We prove a Feynman-Kac formula (FKF) for the self-energy renormalized spin boson Hamiltonian, describing a two-state quantum system linearly coupled to a bosonic quantum field. Sim…