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Propagation of singularities around a Lagrangian submanifold of radial points. (Propagation des singularités près d’une sous-variété Lagrangienne des points radiaux.) (English. French summary) Zbl 1336.35015

Summary: In this work we study the wavefront set of a solution \(u\) to \(Pu=f\), where \(P\) is a pseudodifferential operator on a manifold with real-valued homogeneous principal symbol \(p\), when the Hamilton vector field corresponding to \(p\) is radial on a Lagrangian submanifold \(\Lambda\) contained in the characteristic set of \(P\). The standard propagation of singularities theorem of Duistermaat-Hörmander gives no information at \(\Lambda\). By adapting the standard positive-commutator estimate proof of this theorem, we are able to conclude additional regularity at a point \(q\) in this radial set, assuming some regularity around this point. That is, the a priori assumption is either a weaker regularity assumption at \(q\), or a regularity assumption near but not at \(q\). Earlier results of Melrose and Vasy give a more global version of such analysis. Given some regularity assumptions around the Lagrangian submanifold, they obtain some regularity at the Lagrangian submanifold. This paper microlocalizes these results, assuming and concluding regularity only at a particular point of interest. We then proceed to prove an analogous result, useful in scattering theory, followed by analogous results in the context of Lagrangian regularity.

MSC:

35A21 Singularity in context of PDEs
35P25 Scattering theory for PDEs
35A18 Wave front sets in context of PDEs
58J47 Propagation of singularities; initial value problems on manifolds
58J40 Pseudodifferential and Fourier integral operators on manifolds
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References:

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