A geometric bound on the lowest magnetic Neumann eigenvalue via the torsion function

Autor:	Kachmar, Ayman, Lotoreichik, Vladimir
Rok vydání:	2023
Předmět:	Mathematics - Spectral Theory Mathematical Physics Mathematics - Analysis of PDEs Mathematics - Optimization and Control
Druh dokumentu:	Working Paper
Popis:	We obtain an upper bound on the lowest magnetic Neumann eigenvalue of a bounded, convex, smooth, planar domain with moderate intensity of the homogeneous magnetic field. This bound is given as a product of a purely geometric factor expressed in terms of the torsion function and of the lowest magnetic Neumann eigenvalue of the disk having the same maximal value of the torsion function as the domain. The bound is sharp in the sense that equality is attained for disks. Furthermore, we derive from our upper bound that the lowest magnetic Neumann eigenvalue with the homogeneous magnetic field is maximized by the disk among all ellipses of fixed area provided that the intensity of the magnetic field does not exceed an explicit constant dependent only on the fixed area. Comment: 19 pages
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2312.06161 Zobrazit plný text záznamu View this record from Arxiv