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This content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.The Schrödinger Propagator for Scattering Metrics
Andrew Hassell and Jared Wunsch
Annals of Mathematics
Second Series, Vol. 162, No. 1 (Jul., 2005), pp. 487523
Published by: Annals of Mathematics
Stable URL: http://www.jstor.org/stable/3597378
Page Count: 37
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Abstract
Let g be a scattering metric on a compact manifold X with boundary, i.e., a smooth metric giving the interior $X{{}^\circ}$ the structure of a complete Riemannian manifold with asymptotically conic ends. An example is any compactly supported perturbation of the standard metric on Rn. Consider the operator $H=\frac{1}{2}\Delta +V$, where Δ is the positive Laplacian with respect to g and V is a smooth realvalued function on X vanishing to second order at ∂ X. Assuming that g is nontrapping, we construct a global parametrix ${\cal U}(z,w,t)$ for the kernel of the Schrödinger propagator $U(t)=e^{itH}$, where $z,w\in X{{}^\circ}$ and t ≠ 0. The parametrix is such that the difference between U and U is smooth and rapidly decreasing both as t → 0 and as $z\rightarrow \partial X$, uniformly for w on compact subsets of $X{{}^\circ}$. Let $r=x^{1}$, where x is a boundary defining function for X, be an asymptotic radial variable, and let W(t) be the kernel $e^{ir^{2}/2t}U(t)$. Using the parametrix, we show that W(t) belongs to a class of 'Legendre distributions' on $X\times X{{}^\circ}\times {\Bbb R}_{\geq 0}$ previously considered by HassellVasy. When the metric is trapping, then the parametrix construction goes through microlocally in the nontrapping part of the phase space. We apply this result to determine the singularities of U(t)f, for any tempered distribution f and for any fixed t ≠ 0, in terms of the oscillation of f near ∂ X. If the metric is nontrapping then we precisely determine the wavefront set of U(t)f, and hence also precisely determine its singular support. More generally, we are able to determine the wavefront set of U(t)f for t > 0, resp. t < 0 on the nonbackwardtrapped, resp. nonforwardtrapped subset of the phase space. This generalizes results of CraigKappelerStrauss and Wunsch.
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Annals of Mathematics © 2005 Annals of Mathematics