Several seemingly unrelated linear operators appearing in mathematical physics exhibit similarities in their spectral structure, which is characterized by a particular non-trivial essential spectrum. Examples come from electrodynamics, elasticity theory and fluid dynamics. The point of view of selfadjoint extensions can clarify their relations. In the talk I show recent results about these spectra and explain several open questions.

Joint work with Eric Darrigrand, El-Hadji Koné, Hamdi Sakly, Monique Dauge, Michel Crouzeix.

Slides

Due to technical problems with the microphone, the sound of this video may be partially or completely scrambled, we apologize for this.