Schaeffer's regularity theorem for scalar conservation laws does not extend to systems

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TitleSchaeffer's regularity theorem for scalar conservation laws does not extend to systems
Publication TypeReport Series
Year of Publication2015
AuthorsSpinolo LV, Caravenna L.
SeriesIMATI Report Series
Number15-02
Pagination47 p.
Date PublishedMay
Place PublishedPavia
PublisherCNR-IMATI
Type of WorkWorking paper
Abstract

Schaeffer’s regularity theorem for scalar conservation laws can be loosely speaking formulated as follows. Assume that the flux is uniformly convex, then for a generic smooth initial datum the admissible solution is smooth outside a locally finite number of curves in the (t, x) plane. Here the term "generic” is to be interpreted in a suitable sense, related to the Baire Category Theorem. Whereas other regularity results valid for scalar conservation laws with convex fluxes have been extended to systems of conservation laws with genuinely nonlinear characteristic fields, in this work we exhibit an explicit counterexample which rules out the possibility of extending Schaeffer’s Theorem. The analysis relies on careful interaction estimates and uses fine properties of the wave front-tracking approximation.

KeywordsConservation laws, Regularity, Schaeffer theorem, Shock formation
URIhttp://irs.imati.cnr.it/reports/irs15-02
Citation Keyirs15-02