Regularity properties, representation of solutions and spectral asymptotics of systems with multiplicities

Details Regularity properties, representation of solutions and spectral asymptotics of systems with multiplicities Regularity properties, representation of solutions and spectral asymptotics of systems with multiplicities

2004-02-12

arxiv.org/abs/math/0402203v1

Comm. Partial Differential Equations, 32 (2007), 1-35.

Mathematics

Analysis of PDEs

Scientific paper

Properties of solutions of generic hyperbolic systems with multiple characteristics with diagonalizable principal part are investigated. Solutions are represented as a Picard series with terms in the form of iterated Fourier integral operators. It is shown that this series is an asymptotic expansion with respect to smoothness under quite general geometric conditions. Propagation of singularities and sharp regularity properties of solutions are obtained. Results are applied to establish regularity estimates for scalar weakly hyperbolic equations with involutive characteristics. They are also applied to derive the first and second terms of spectral asymptotics for the corresponding elliptic systems.

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