1. Institut für Mathematik, Humboldt-Universit?t zu Berlin, Rudower Chaussee 25, 12489, Berlin, Germany 2. Institute for Problems in Mechanics RAS, pr. Vernadskogo 101-1, Moscow, 119526, Russia
Abstract:
The spectrum of quantum waveguides simulating thin toroidal tubes and thin spherical surfaces is investigated. Asymptotic
formulas are obtained and a geometric classification using the so-called Reeb graphs is carried out.