We consider a boundary value problem in a bounded domain involving a degenerate operator of the form
and a suitable nonlinearity f. The function a vanishes on smooth 1-codimensional submanifolds of Ω where it is not allowed to be . By using weighted Sobolev spaces we are still able to find existence of solutions which vanish, in the trace sense, on the set where a vanishes.
F.S.Cîrstea and V.Rǎdulescu, Multiple solutions of degenerate perturbed elliptic problems involving a subcritical Sobolev exponent, Topological Methods in Nonlinear Analysis15 (2000), 283–300. doi:10.12775/TMNA.2000.021.
3.
C.L.Epstein and R.Mazzeo, Degenerate Diffusion Operators Arising in Population Biology, Annals of Mathematics Studies, Vol. 185, Princeton University Press, Princeton, NJ, 2013.
4.
C.L.Epstein and R.Mazzeo, The geometric microlocal analysis of generalized Kimura and Heston diffusions, in: Analysis and Topology in Nonlinear Differential Equations, D.G.de Figueiredo, J.M.do Ó and C.Tomei, eds, Progress in Nonlinear Differential Equations and Their Applications, Vol. 85, Springer International Publishing AG, New York, NY, 2014, pp. 241–266. doi:10.1007/978-3-319-04214-5_14.
5.
E.Fabes, D.Jerison and C.Kenig, The Wiener test for degenerate elliptic equations, Ann. Inst. Fourier (Grenoble)32 (1982), 151–182.
6.
E.G.Fabes, C.E.Kenig and R.P.Serapioni, The local regularity of solutions of degenerate elliptic equations, Commun. Part. Diff. Eq.7(1) (1982), 77–116. doi:10.1080/03605308208820218.
7.
B.Franchi and R.Serapioni, Pointwise estimates for a class of strongly degenerate elliptic operators: A geometrical approach, Ann. Scuola Norm. Sup. Pisa Cl. Sci. (4)14(4) (1987), 527–568.
8.
V.Gol’dshtein and A.Ukhlov, Weighted Sobolev spaces and embedding theorems, Trans. Amer. Math. Soc.361(7) (2009), 3829–3850. doi:10.1090/S0002-9947-09-04615-7.
9.
J.Heinonen, T.Kilpelaïnen and O.Martio, Nonlinear Potential Theory of Degenerate Elliptic Equations, Oxford Mathematical Monographs. Oxford Science Publications., The Clarendon Press, Oxford University Press, New York, 1993.
10.
M.Kimura, Diffusion models in population genetics, Journal of Applied Probability1 (1964), 177–232. doi:10.2307/3211856.
A.Kufner, O.John and S.Fučik, Function Spaces. Monographs and Textbooks on Mechanics of Solids and Fluids; Mechanics: Analysis, Noordhoff International Publishing, Leyden; Academia, Prague, 1977.
13.
A.Kufner and B.Opic, How to define reasonably weighted Sobolev spaces, Commentationes Mathematicae Universitatis Carolinae25(3) (1984), 537–554.
14.
D.Monticelli, K.R.Payne and F.Punzo, Poincaré inequalities for Sobolev spaces with matrix-valued weights and applications to degenerate partial differential equations, Proc. Roy. Soc. Edinburgh Sect. A149(1) (2019), 61–100. doi:10.1017/S0308210517000427.
15.
B.Muckenhoupt, Weighted norm inequalities for the Hardy maximal function, Trans. Amer. Math. Soc.165 (1972), 207–226. doi:10.1090/S0002-9947-1972-0293384-6.
16.
M.K.V.Murthy and G.Stampacchia, Boundary problems for some degenerate elliptic operators, Ann. Mat. Pura Appl4(80) (1968), 1–122. doi:10.1007/BF02413623.
17.
P.Pucci and J.Serrin, Dead cores and bursts for quasilinear singular elliptic equations, Siam J. Math. Anal.38(1) (2006), 259–278. doi:10.1137/050630027.
18.
A.-M.Sändig and A.Kufner, Some applications of weighted Sobolev spaces, in: Teubner-Texte zur Mathematik, Vol. 100, Vieweg Teubner Verlag, 1987.
19.
A.Torchinsky, Real-Variable Methods in Harmonic Analysis, Pure and Applied Mathematics, Vol. 123, Academic Press, Inc., Orlando, FL, 1986.