M. Langer

activity

20092023

most citedSchrödinger operators with delta and delta'-potentials supported on hypersurfaces

79 citations · 264 across the 22 of their papers we have counts for

collaborators

Showing 2014Show all

3 papers · 1 filter

math.FA2014★ 2 cited

Variational principles for self-adjoint operator functions arising from second-order systems

Birgit Jacob, Matthias Langer, Carsten Trunk

Variational principles are proved for self-adjoint operator functions arising from variational evolution equations of the form \[ \langle\ddot{z}(t),y \rangle + \mathfrak{d}[\dot{z…

math.SP2014★ 4 cited

Spectral properties of unbounded J-self-adjoint matrices

Matthias Langer, Michael Strauss

We study the spectrum of unbounded J-self-adjoint block operator matrices. In particular, we prove enclosures for the spectrum, provide a sufficient condition for the spectrum bein…

math.SP2014★ 9 cited

Spectral asymptotics for resolvent differences of elliptic operators with $δ$ and $δ^{'}$ -interactions on hypersurfaces

Jussi Behrndt, Gerd Grubb, Matthias Langer +1

We consider self-adjoint realizations of a second-order elliptic differential expression on $R^{n}$ with singular interactions of $δ$ and $δ^{'}$ -type supported on a com…

Variational principles for self-adjoint operator functions arising from second-order systems

Spectral properties of unbounded J-self-adjoint matrices

Spectral asymptotics for resolvent differences of elliptic operators with δ and δ′-interactions on hypersurfaces

Spectral asymptotics for resolvent differences of elliptic operators with $δ$ and $δ^{'}$ -interactions on hypersurfaces