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A note on contractive semi-groups on a 1:1 junction for scalar conservation laws and Hamilton–Jacobi equations
[À propos des semi-groupes contractants sur des jonctions 1 :1 pour des lois de conservation scalaires et des équations de Hamilton–Jacobi]
Comptes Rendus. Mathématique, Volume 363 (2025), pp. 499-510.

We characterize the continuous semi-groups on L1(R) which coincide with a scalar conservation law ρt+(f(ρ))x=0 in R+×(R{0}) and are L1-contracting. In a symmetric way, we characterize the continuous semi-groups on W1,(R) which coincide with a Hamilton–Jacobi equation ut+H(ux)=0 in R+×(R{0}) and are L-contracting. These questions appear in traffic flow models for instance.

Nous caractérisons les semi-groupes continus sur L1(R) qui coïncident avec une loi de conservation scalaire ρt+(f(ρ))x=0 dans R+×(R{0}) et sont L1-contractants. De façon symétrique, nous caractérisons les semi-groupes sur W1,(R) qui coïncident avec l’équation Hamilton–Jacobi ut+H(ux)=0 dans R+×(R{0}) et sont L-contractants. Ces équations apparaissent notamment dans des modèles de trafic.

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DOI : 10.5802/crmath.727
Keywords: Scalar conservation laws, traffic flow models, Hamilton–Jacobi equations, flux limiter, discontinuous fluxes
Mots-clés : Lois de conservation scalaire, modèles de trafic, équations de Hamilton–Jacobi, limiteur de flux, flux discontinus

Pierre Cardaliaguet 1

1 Université Paris-Dauphine, PSL Research University, Ceremade, Place du Maréchal de Lattre de Tassigny, 75775 Paris cedex 16, France
Licence : CC-BY 4.0
Droits d'auteur : Les auteurs conservent leurs droits
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     title = {A note on contractive semi-groups on a 1:1 junction for scalar conservation laws and {Hamilton{\textendash}Jacobi} equations},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {499--510},
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     doi = {10.5802/crmath.727},
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Pierre Cardaliaguet. A note on contractive semi-groups on a 1:1 junction for scalar conservation laws and Hamilton–Jacobi equations. Comptes Rendus. Mathématique, Volume 363 (2025), pp. 499-510. doi : 10.5802/crmath.727. https://comptes-rendus.academie-sciences.fr/mathematique/articles/10.5802/crmath.727/

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