Magnetic Lieb-Thirring inequalities with optimal dependence on the field strength

TL;DR

This paper introduces a new magnetic Lieb-Thirring inequality with optimal dependence on magnetic field strength, providing simpler proofs and refining previous bounds for quantum particles in magnetic fields.

Contribution

It presents a new, simplified proof of a magnetic Lieb-Thirring inequality with optimal field dependence and summarizes recent refinements with improved bounds.

Findings

New simple proof of MLT inequality

Optimal growth with magnetic field strength

Bounds on zero energy eigenfunctions

Abstract

The Pauli operator describes the energy of a nonrelativistic quantum particle with spin 1/2 in a magnetic field and an external potential. Bounds on the sum of the negative eigenvalues are called magnetic Lieb-Thirring (MLT) inequalities. The purpose of this paper is twofold. First, we prove a new MLT inequality in a simple way. Second, we give a short summary of our recent proof of a more refined MLT inequality \cite{ES-IV} and we explain the differences between the two results and methods. The main feature of both estimates, compared to earlier results, is that in the large field regime they grow with the optimal (first) power of the strength of the magnetic field. As a byproduct of the method, we also obtain optimal upper bounds on the pointwise density of zero energy eigenfunctions of the Dirac operator.