Jonathan Breuer, Eric Ryckman, Barry Simon
Equality of the Spectral and Dynamical Definitions of Reflection
(270K, pdf)

ABSTRACT.  For full-line Jacobi matrices, Schr\"odinger operators, and CMV matrices, we show that being reflectionless, in the sense 
of the well-known property of $m$-functions, is equivalent to a lack of reflection in the dynamics in the sense that any state 
that goes entirely to $x=-\infty$ as $t\to -\infty $ goes entirely to $x=\infty$ as $t\to\infty$. This allows us to settle 
a conjecture of Deift and Simon from 1983 regarding ergodic Jacobi matrices.