Approximation of diffuse measures for parabolic capacities

Petitta, Francesco; Ponce, Augusto C.; Porretta, Alessio

doi:10.1016/j.crma.2007.12.002

Partial Differential Equations

Approximation of diffuse measures for parabolic capacities
[Approximation des mesures diffuses pour des capacités paraboliques]

Présenté par : Haïm Brezis

Petitta, Francesco ¹ ; Ponce, Augusto C.² ; Porretta, Alessio ³

¹ Dipartimento di Matematica, Università di Roma La Sapienza, Piazzale A. Moro 2, 00185 Roma, Italy
² Laboratoire de mathématiques et physique théorique (CNRS UMR 6083), Université de Tours, 37200 Tours, France
³ Dipartimento di Matematica, Università di Roma Tor Vergata, Via della Ricerca Scientifica 1, 00133 Roma, Italy

Comptes Rendus. Mathématique, Tome 346 (2008) no. 3-4, pp. 161-166.

Résumé
Abstract

Étant donné un cylindre parabolique $Q = (0, T) \times Ω$ , avec $Ω \subset R^{N}$ , on considère la classe des mesures bornées sur Q qui ne chargent pas les ensembles de p-capacité nulle. Nous démontrons que ces mesures peuvent être approchées au sens fort par des mesures de la forme $v_{t} - Δ_{p} v$ avec $v \in L^{p} (0, T; W_{0}^{1, p} (Ω)) \cap L^{\infty} (Q)$ . Des estimations sur la capacité des ensembles de niveau des solutions d'équations paraboliques jouent un rôle crucial dans notre preuve.

Given a parabolic cylinder $Q = (0, T) \times Ω$ , with $Ω \subset R^{N}$ , we consider the class of finite measures which do not charge sets of zero p-parabolic capacity in Q. We prove that such measures can be strongly approximated by measures which can be written as $v_{t} - Δ_{p} v$ with $v \in L^{p} (0, T; W_{0}^{1, p} (Ω)) \cap L^{\infty} (Q)$ . Estimates on the capacity of level sets of solutions of parabolic equations play a crucial role in our proof.

Accepté le : 2007-11-25
Publié le : 2008-01-14

DOI : 10.1016/j.crma.2007.12.002

Affiliations des auteurs :

Petitta, Francesco ¹ ; Ponce, Augusto C. ² ; Porretta, Alessio ³

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     title = {Approximation of diffuse measures for parabolic capacities},
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Petitta, Francesco; Ponce, Augusto C.; Porretta, Alessio. Approximation of diffuse measures for parabolic capacities. Comptes Rendus. Mathématique, Tome 346 (2008) no. 3-4, pp. 161-166. doi : 10.1016/j.crma.2007.12.002. http://www.numdam.org/articles/10.1016/j.crma.2007.12.002/

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