Two-parameter asymptotics in magnetic Weyl calculus

研究成果: Article査読

3 被引用数 (Scopus)


This paper is concerned with small parameter asymptotics of magnetic quantum systems. In addition to a semiclassical parameter ε, the case of small coupling λ to the magnetic vector potential naturally occurs in this context. Magnetic Weyl calculus is adapted to incorporate both parameters, at least one of which needs to be small. Of particular interest is the expansion of the Weyl product which can be used to expand the product of operators in a small parameter, a technique which is prominent to obtain perturbation expansions. Three asymptotic expansions for the magnetic Weyl product of two HÖrmander class symbols are proven as (i) ε ≪ 1 and λ ≪ 1, (ii) ε ≪ 1 and λ = 1, as well as (iii) ε = 1 and λ ≪ 1. Expansions (i) and (iii) are impossible to obtain with ordinary Weyl calculus. Furthermore, I relate the results derived by ordinary Weyl calculus with those obtained with magnetic Weyl calculus by one- and two-parameter expansions. To show the power and versatility of magnetic Weyl calculus, I derive the semirelativistic Pauli equation as a scaling limit from the Dirac equation up to errors of fourth order in 1/c.

ジャーナルJournal of Mathematical Physics
出版ステータスPublished - 2010 12月 1

ASJC Scopus subject areas

  • 統計物理学および非線形物理学
  • 数理物理学


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