On sait que le semi-groupe associé au Problème de Cauchy pour une loi de conservation scalaire est contractant dans , mais qu’il ne l’est pas dans si . Leger a montré dans [20], pour un flux convexe, une propriété de contraction dans moyennant une translation. Nous examinons ici la possibilité d’une telle propriété pour les systèmes. Notre analyse nous conduit à la notion géométrique de système Vraiment pas Temple. Nous traitons en détail deux exemples : – le système de Keyfitz et Kranzer avec flux isotrope, pour lequel la contraction a lieu, – le système de la dynamique des gaz, où ce n’est pas le cas.
The semi-group associated with the Cauchy problem for a scalar conservation law is known to be a contraction in . However it is not a contraction in for any . Leger showed in [20] that for a convex flux, it is however a contraction in up to a suitable shift. We investigate in this paper whether such a contraction may happen for systems. The method is based on the relative entropy method. Our general analysis leads us to the new geometrical notion of Genuinely non-Temple systems. We treat in details two examples: – the Keyfitz–Kranzer system with rotationally invariant flux, for which the contraction holds true, – the Euler system of gas dynamics, for which it does not.
@article{JEP_2014__1__1_0, author = {Serre, Denis and Vasseur, Alexis F.}, title = {$L^2$-type contraction for systems of conservation laws}, journal = {Journal de l'\'Ecole polytechnique - Math\'ematiques}, volume = {1}, year = {2014}, pages = {1-28}, doi = {10.5802/jep.1}, language = {en}, url = {http://dml.mathdoc.fr/item/JEP_2014__1__1_0} }
Serre, Denis; Vasseur, Alexis F. $L^2$-type contraction for systems of conservation laws. Journal de l'École polytechnique - Mathématiques, Tome 1 (2014) pp. 1-28. doi : 10.5802/jep.1. http://gdmltest.u-ga.fr/item/JEP_2014__1__1_0/
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