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Constanza Rojas-Molina, Ivan Veselić: Scale-free unique continuation estimates and applications to random Schrödinger operators

Constanza Rojas-Molina, Ivan Veselić: Scale-free unique continuation estimates and applications to random Schrödinger operators

Author(s):
Constanza Rojas-Molina
Ivan Veselić
Title:
Constanza Rojas-Molina, Ivan Veselić: Scale-free unique continuation estimates and applications to random Schrödinger operators
Electronic source:
application/pdf
Preprint series:
Technische Universität Chemnitz, Fakultät für Mathematik (Germany). Preprint 11, 2012
Mathematics Subject Classification:
35J10 []
60H25 []
82B44 []
93B07 []
Abstract:
We prove a unique continuation principle or uncertainty relation valid for Schrödinger operator eigenfunctions, or more generally solutions of a Schrödinger inequality, on cubes of side $L\in 2\NN+1$. It establishes an equi-distribution property of the eigenfunction over the box: the total $L^2$-mass in the box of side $L$ is estimated from above by a constant times the sum of the $L^2$-masses on small balls of a fixed radius $\delta>0$ evenly distributed throughout the box. The dependence of the constant on the various parameters entering the problem is given explicitly. Most importantly, there is no $L$-dependence. This result has important consequences for the perturbation theory of eigenvalues of Schrödinger operators, in particular random ones. For so-called Delone-Anderson models we deduce Wegner estimates, a lower bound for the shift of the spectral minimum, and an uncertainty relation for spectral projectors.
Keywords:

Language:
English
Publication time:
10/2012