Hamiltonians for polaron models with subcritical ultraviolet singularities
Mathematical Physics
2023-10-11 v2 math.MP
Abstract
We treat the ultraviolet problem for polaron-type models in nonrelativistic quantum field theory. Assuming that the dispersion relations of particles and the field have the same growth at infinity, we cover all subcritical (superrenormalisable) interactions. The Hamiltonian without cutoff is exhibited as an explicit self-adjoint operator obtained by a finite iteration procedure. The cutoff Hamiltonians converge to this operator in the strong resolvent sense after subtraction of a perturbative approximation for the ground-state energy.
Keywords
Cite
@article{arxiv.2203.07253,
title = {Hamiltonians for polaron models with subcritical ultraviolet singularities},
author = {Jonas Lampart},
journal= {arXiv preprint arXiv:2203.07253},
year = {2023}
}