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Well-Posedness of Higher Order Hyperbolic Pseudo-Differential Equations with Multiplicities
Claudia Garetto1, Bolys Sabitbek2,3
1School of Mathematical Sciences, Queen Mary University of London, Mile End Road, E1 4UJ London, UK.
Abstract:
In this paper, we study higher order hyperbolic pseudo-differential equations with variable multiplicities. We work in arbitrary space dimension and we assume that the principal part is time-dependent only. We identify sufficient conditions on the roots and the lower order terms (Levi conditions) under which the corresponding Cauchy problem is well-posed. This is achieved via transformation into a first order system, reduction into upper-triangular form and application of suitable Fourier integral operator methods previously developed for hyperbolic non-diagonalisable systems. We also discuss how our result compares with the literature on second and third order hyperbolic equations.
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