The Resolvent of the Nelson Hamiltonian Improves Positivity

@article{Lampart2021TheRO,
  title={The Resolvent of the Nelson Hamiltonian Improves Positivity},
  author={Jonas Lampart},
  journal={Mathematical Physics, Analysis and Geometry},
  year={2021},
  volume={24},
  pages={1-17}
}
  • J. Lampart
  • Published 7 October 2020
  • Mathematics
  • Mathematical Physics, Analysis and Geometry
We give a new proof that the resolvent of the renormalised Nelson Hamiltonian at fixed total momentum P improves positivity in the (momentum) Fock-representation, for every P . The argument is based on an explicit representation of the renormalised operator and its domain using interior boundary conditions, which allows us to avoid the intermediate steps of regularisation and renormalisation used in other proofs of this result. 
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