Hamiltonian of free field on infinite-dimensional hypercube
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Published:2023-11-20
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Volume:
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ISSN:0219-0257
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Container-title:Infinite Dimensional Analysis, Quantum Probability and Related Topics
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language:en
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Short-container-title:Infin. Dimens. Anal. Quantum. Probab. Relat. Top.
Author:
Zhang Lixia1ORCID,
Wang Caishi1ORCID
Affiliation:
1. School of Mathematics and Statistics, Northwest Normal University, Lanzhou, Gansu 730070, P. R. China
Abstract
The infinite-dimensional hypercube (IDH) is an infinite connected graph with infinite degree at each its vertex, and can be viewed as an infinite-dimensional analog of finite-dimensional hypercubes. In this paper, we investigate a self-adjoint operator determined by the topology of the IDH and a function on the nonnegative integers, which can be interpreted as the Hamiltonian of a free fermion field. We prove that, under some mild conditions, the operator has only pure point spectrum and its spectrum is even a compact interval of the real line. We also obtain some commutation relations concerning the operator, which are of physical interest.
Funder
National Natural Science Foundation of China
Publisher
World Scientific Pub Co Pte Ltd
Subject
Applied Mathematics,Mathematical Physics,Statistics and Probability,Statistical and Nonlinear Physics