|
|||||
 |
|
|
|
|
Well-posedness of
Lagrangian flows and continuity equations in metric measure
spaces
Luigi Ambrosio and Dario Trevisan |
|
Vol. 7 (2014), No. 5, 1179–1234
|
Abstract |
|
We establish, in a rather general setting, an analogue of DiPerna–Lions theory on well-posedness of flows of ODEs associated to Sobolev vector fields. Key results are a well-posedness result for the continuity equation associated to suitably defined Sobolev vector fields, via a commutator estimate, and an abstract superposition principle in (possibly extended) metric measure spaces, via an embedding into . When specialized to the setting of Euclidean or infinite-dimensional (e.g., Gaussian) spaces, large parts of previously known results are recovered at once. Moreover, the class of metric measure spaces, introduced by Ambrosio, Gigli and Savaré [Duke Math. J. 163:7 (2014) 1405–1490] and the object of extensive recent research, fits into our framework. Therefore we provide, for the first time, well-posedness results for ODEs under low regularity assumptions on the velocity and in a nonsmooth context. |
Keywords
continuity equation, flows, DiPerna–Lions theory,
$\Gamma$-calculus
|
Mathematical Subject Classification 2010
Primary: 49J52
Secondary: 35K90
|
Milestones
Received: 19 February 2014
Accepted: 12 July 2014
Published: 27 September 2014
|
Authors |
| Luigi Ambrosio | |
| Classe di Scienze Scuola Normale Superiore I-56126 Pisa Italy |
|
| Dario Trevisan | |
| Classe di Scienze Scuola Normale Superiore I-56126 Pisa Italy |
|
|
