Analytic Perturbation Theory and Renormalization Analysis of Matter Coupled to Quantized Radiation

Abstract

For a large class of quantum mechanical models of matter and radiation we develop an analytic perturbation theory for non-degenerate ground states. This theory is applicable, for example, to models of matter with static nuclei and non-relativistic electrons that are coupled to the UV-cutoff quantized radiation field in the dipole approximation. If the lowest point of the energy spectrum is a non-degenerate eigenvalue of the Hamiltonian, we show that this eigenvalue is an analytic function of the nuclear coordinates and of ${\alpha }^{3/2}$, $\alpha$ being the fine structure constant. A suitably chosen ground state vector depends analytically on ${\alpha }^{3/2}$ and it is twice continuously differentiable with respect to the nuclear coordinates.

47 pages

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