Diff. Geom, Math. Phys., PDE Seminar: Christian Sadel

  • Date: 10/16/2012
Christian Sadel, UBC

University of British Columbia


Absolutely continuous spectrum for random Schrödinger operators on tree-strips of finite cone-type.


One of the biggest challenges in the field of random Schrödinger operators is to prove the existence of absolutely continuous spectrum for the Anderson model for small disorder in dimensions greater equal to 3. So far, the existence of absolutely continuous spectrum is only known for models on infinite-dimensional tree structures. The first proof, done by Abel Klein for a regular tree, dates back to 1994.


Recent developments considered trees of finite cone type and cross products of trees with finite graphs, so called tree-strips. I will present a proof for the existence of absolutely continuous spectrum for models on tree-strips of finite cone type. The proof uses a version of the Implicit Function Theorem in Banach spaces which are constructed by a supersymmetric formalism using Grassmann variables.

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Location: ESB 2012