Gradient flows of time-dependent functionals in metric spaces and applications to PDEs

Lucas C.F. Ferreira, Julio Cesar Valencia Guevara

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

We develop a gradient-flow theory for time-dependent functionals defined in abstract metric spaces. Global well-posedness and asymptotic behavior of solutions are provided. Conditions on functionals and metric spaces allow to consider the Wasserstein space P2(Rd) and apply the results to a large class of PDEs with time-dependent coefficients like confinement and interaction potentials. For that matter, we need to consider some residual terms, time-versions of concepts like λ-convexity, time-differentiability of minimizers for Moreau–Yosida approximations, and a priori estimates with explicit time-dependence for De Giorgi interpolation. Here, functionals can be unbounded from below and their sublevels need not be compact. In order to obtain strong convergence, a careful analysis is done by using a type of λ-convexity that changes as the time evolves. Our results can be seen as an extension of those in Ambrosio et al. (Gradient flows: in metric spaces and in the space of probability measures, Birkhäuser, Basel, 2005) to the case of time-dependent functionals and Rossi et al. (Ann Sc Norm Super Pisa Cl Sci 7(1):97–169, 2008) to functionals with noncompact sublevels.

Original languageEnglish
Pages (from-to)231-268
Number of pages38
JournalMonatshefte fur Mathematik
Volume185
Issue number2
DOIs
StatePublished - 1 Feb 2018
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2017, Springer-Verlag Wien.

Keywords

  • Gradient flows
  • Measure solutions
  • Optimal transport
  • Time-dependent functionals

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