2013/03/25 by Hans Christianson, Christianson, Hans · 3 citations
Mathematics · Physics and Astronomy · #Advanced Mathematical Physics Problems #Quantum chaos and dynamical systems #Spectral Theory in Mathematical Physics #math.AP #math.SP #msc:35B34 #msc:58J50
paper · pdf · doi:10.48550/arxiv.1303.6172
46 pages. Contains summaries of the author's results (with co-authors) from arXiv:1103.3908, arXiv:1303.3309
arxiv created 2013/03/25 · arxiv updated 2013/03/26
We consider the resolvent on asymptotically Euclidean warped product manifolds in an appropriate 0-Gevrey class, with trapped sets consisting of only finitely many components. We prove that the high-frequency resolvent is either bounded by Cε|λ|ε for any ε>0, or blows up faster than any polynomial (at least along a subsequence). A stronger result holds if the manifold is analytic. The method of proof is to exploit the warped product structure to separate variables, obtaining a one-dimensional semiclassical Schrödinger operator. We then classify the microlocal resolvent behaviour associated to every possible type of critical value of the potential, and translate this into the associated resolvent estimates. Weakly stable trapping admits highly concentrated quasimodes and fast growth of the resolvent. Conversely, using a delicate inhomogeneous blowup procedure loosely based on the classical positive commutator argument, we show that any weakly unstable trapping forces at least some spreading of quasimodes. As a first application, we conclude that either there is a resonance free region of size | \Im λ| ≤ Cε| \Re λ|-1-ε for any ε>0, or there is a sequence of resonances converging to the real axis faster than any polynomial. Again, a stronger result holds if the manifold is analytic. As a second application, we prove a spreading result for weak quasimodes in partially rectangular billiards.