2023-03-24T15:35:00Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/691792022-11-17T02:08:08Zhdl_2115_45007hdl_2115_116Uniqueness of the ground state of a model in quantum electrodynamics A functional integral approachHiroshima, F.410The system of a particle minimally coupled to a radiation field with an 1iltraviolet cut-off is considered. The Hamiltonian of the system is defined with non-perturbative approach; any assumptions on the magnitude of the absolute value of a coupling conĀstant in the Hamiltonian is not required. It. is established that the ground state of the system, if exists, is unique and overlapps with the ground state of a decoupled Hamiltonian.Department of Mathematics, Hokkaido UniversityDepartmental Bulletin Paperapplication/pdfhttp://hdl.handle.net/2115/69179info:doi/10.14943/83575https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/69179/1/pre429.pdfHokkaido University Preprint Series in Mathematics4291321998-09-01engpublisher