Affiliation:
1. Faculty of Mathematics, Kyushu University, Fukuoka Motooka 744, 819-0395, Japan
2. Institut for Matematiske Fag, Aalborg Universitet, Skjernvej 4A, 9220 Aalborg, Denmark
Abstract
We prove the existence, uniqueness, and strict positivity of ground states of the possibly massless renormalized Nelson operator under an infrared regularity condition and for Kato decomposable electrostatic potentials fulfilling a binding condition. If the infrared regularity condition is violated, then we show non-existence of ground states of the massless renormalized Nelson operator with an arbitrary Kato decomposable potential. Furthermore, we prove the existence, uniqueness, and strict positivity of ground states of the massless renormalized Nelson operator in a non-Fock representation where the infrared condition is unnecessary. Exponential and superexponential estimates on the pointwise spatial decay and the decay with respect to the boson number for elements of spectral subspaces below localization thresholds are provided. Moreover, some continuity properties of ground state eigenvectors are discussed. Byproducts of our analysis are a hypercontractivity bound for the semigroup and a new remark on Nelson’s operator theoretic renormalization procedure. Finally, we construct path measures associated with ground states of the renormalized Nelson operator. Their analysis entails improved boson number decay estimates for ground state eigenvectors, as well as upper and lower bounds on the Gaussian localization with respect to the field variables in the ground state. As our results on uniqueness, positivity, and path measures exploit the ergodicity of the semigroup, we restrict our attention to one matter particle. All results are non-perturbative.
Funder
Science Research
Spectral Analysis of Large Particle Systems
Danish Agency for Science, Technology and Innovation via the International Network Programme
Publisher
World Scientific Pub Co Pte Ltd
Subject
Mathematical Physics,Statistical and Nonlinear Physics
Cited by
7 articles.
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