Abstract
We consider solutions, u ∈ H sloc (Ω̄), s > (dim Ω + 1)/2, satisfying
on Ω = R t × ω, where ω ⊂ R n z is an open set with smooth boundary; P is a second-order differential operator with C ∞ coefficients on R n+1(t, z) , noncharacteristic with respect to bΩ and strictly hyperbolic with respect to the planes t = c; and f ∈ C ∞.Interactions between singularity-bearing bicharacteristics taking place in the interior of Ω in t > t̄ can produce anomalous singularities in u, that is, singularities not present in the function u satisfying Pu = 0, u│ b Ω = u│ b Ω in t < t̄ These singularities can have strength at most ~ 3s - n (Beals [1]) and are generated by processes, crossing and self-spreading, that have been well-understood for some time (Beals [2], [3]). In this paper we shall describe propagation and interaction at the boundary, where generalized bicharacteristics [6], which typically contain segments of reflecting, grazing, or gliding rays, carry singularities.
Supported by NSF Grant DMS-8701654 and an Alfred P. Sloan Research Fellowship.
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© 1991 Springer-Verlag New York, Inc.
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Williams, M. (1991). Interaction of Singularities and Propagation into Shadow Regions in Semilinear Boundary Problems. In: Beals, M., Melrose, R.B., Rauch, J. (eds) Microlocal Analysis and Nonlinear Waves. The IMA Volumes in Mathematics and its Applications, vol 30. Springer, New York, NY. https://doi.org/10.1007/978-1-4613-9136-4_14
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DOI: https://doi.org/10.1007/978-1-4613-9136-4_14
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