2004/03/23 by Francois James, Simona Mancini, Francois Bouchut · 3 citations
Mathematics · #math.AP #msc:35F10 #msc:34A36 #msc:35D05 #msc:35B35
published as Annali della Scuola Normale Superiore di Pisa, Cl. Sci. (5) IV (2005) 1-25 · 19-03-2004
arxiv created 2004/03/23 · arxiv updated 2009/12/01
The Cauchy problem for a multidimensional linear transport equation with discontinuous coefficient is investigated. Provided the coefficient satisfies a one-sided Lipschitz condition, existence, uniqueness and weak stability of solutions are obtained for either the conservative backward problem or the advective forward problem by duality. Specific uniqueness criteria are introduced for the backward conservation equation since weak solutions are not unique. A main point is the introduction of a generalized flow in the sense of partial differential equations, which is proved to have unique jacobian determinant, even though it is itself nonunique.