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On the uniqueness of ground states of non-local equations

Rupert L. Frank — 2011

Journées Équations aux dérivées partielles

We review our joint result with E. Lenzmann about the uniqueness of ground state solutions of non-linear equations involving the fractional Laplacian and provide an alternate uniqueness proof for an equation related to the intermediate long-wave equation.

Sharp trace asymptotics for a class of 2 D -magnetic operators

Horia D. CorneanSøren FournaisRupert L. FrankBernard Helffer — 2013

Annales de l’institut Fourier

In this paper we prove a two-term asymptotic formula for the spectral counting function for a 2 D magnetic Schrödinger operator on a domain (with Dirichlet boundary conditions) in a semiclassical limit and with strong magnetic field. By scaling, this is equivalent to a thermodynamic limit of a 2 D Fermi gas submitted to a constant external magnetic field. The original motivation comes from a paper by H. Kunz in which he studied, among other things, the boundary correction for the grand-canonical...

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