Upper and lower bounds for an eigenvalue associated with a positive eigenvector
谱理论
2009-11-11 v1 数学物理
math.MP
量子物理
摘要
When an eigenvector of a semi-bounded operator is positive, we show that a remarkably simple argument allows to obtain upper and lower bounds for its associated eigenvalue. This theorem is a substantial generalization of Barta-like inequalities and can be applied to non-necessarily purely quadratic Hamiltonians. An application for a magnetic Hamiltonian is given and the case of a discrete Schrodinger operator is also discussed. It is shown how this approach leads to some explicit bounds on the ground-state energy of a system made of an arbitrary number of attractive Coulombian particles.
引用
@article{arxiv.math/0505541,
title = {Upper and lower bounds for an eigenvalue associated with a positive eigenvector},
author = {Amaury Mouchet},
journal= {arXiv preprint arXiv:math/0505541},
year = {2009}
}