Geodesic
Uniform Lipschitz regularity for classes of minimizers in two phase free boundary problems in Orlicz spaces with small density on the negative phase
Annales de l'I.H.P. Analyse non linéaire, Tome 31 (2014) no. 4, pp. 823-850

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In this paper we investigate Lipschitz regularity of minimizers for classes of functionals including ones of the type E G (u,Ω)=∫ Ω [G(|∇u|)+f 2 χ {u>0} +f 1 χ {u⩽0} ]dx. We prove that there exists a universal “tolerance” (depending only on the degenerate ellipticity and other intrinsic parameters) for the density of the negative phase along the free boundary under which uniform Lipschitz regularity holds. We also prove density estimates from below for the negative phase on points inside the contact set between the negative and positive free boundaries in the case where Lipschitz regularity fails to be the optimal one.

DOI : 10.1016/j.anihpc.2013.07.006
Classification : 35J60, 35J70, 35J75, 35R35, 46E30, 49K20
Keywords: Free boundary problems, Two phase problems, Minimizers, Orlicz spaces, Degenerate/singular elliptic equations, Lipschitz regularity, Density negative phase 
@article{AIHPC_2014__31_4_823_0,
     author = {Braga, J. Ederson M. and Moreira, Diego R.},
     title = {Uniform {Lipschitz} regularity for classes of minimizers in two phase free boundary problems in {Orlicz} spaces with small density on the negative phase},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {823--850},
     publisher = {Elsevier},
     volume = {31},
     number = {4},
     year = {2014},
     doi = {10.1016/j.anihpc.2013.07.006},
     zbl = {1301.49097},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1016/j.anihpc.2013.07.006/}
}
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Braga, J. Ederson M.; Moreira, Diego R. Uniform Lipschitz regularity for classes of minimizers in two phase free boundary problems in Orlicz spaces with small density on the negative phase. Annales de l'I.H.P. Analyse non linéaire, Tome 31 (2014) no. 4, pp. 823-850. doi: 10.1016/j.anihpc.2013.07.006

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