Quantum Monodromy and Non-concentration near a Closed Semi-Hyperbolic Orbit

Details Quantum Monodromy and Non-concentration near a Closed Semi-Hyperbolic Orbit Quantum Monodromy and Non-concentration near a Closed Semi-Hyperbolic Orbit

2008-03-05

arxiv.org/abs/0803.0697v1

Mathematics

Analysis of PDEs

Scientific paper

For a large class of semiclassical operators $P(h)-z$ which includes Schr\"odinger operators on manifolds with boundary, we construct the Quantum Monodromy operator $M(z)$ associated to a periodic orbit $\gamma$ of the classical flow. Using estimates relating $M(z)$ and $P(h)-z$, we prove semiclassical estimates for small complex perturbations of $P(h) -z$ in the case $\gamma$ is semi-hyperbolic. As our main application, we give logarithmic lower bounds on the mass of eigenfunctions away from semi-hyperbolic orbits of the associated classical flow. As a second application of the Monodromy Operator construction, we prove if $\gamma$ is an elliptic orbit, then $P(h)$ admits quasimodes which are well-localized near $\gamma$.

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