Local existence conditions for an equations involving the $${{\varvec{p}}}({{\varvec{x}}})$$ -Laplacian with critical exponent in $${\mathbb {R}}^N$$

Nicolas Saintier1, Analia Silva2
1Departamento de Matemática, FCEyN - Universidad de Buenos Aires, Buenos Aires, Argentina
2Instituto de Matemática Aplicada San Luis, IMASL, Universidad Nacional de San Luis and CONICET, San Luis, Argentina

Tóm tắt

The purpose of this paper is to formulate sufficient existence conditions for a critical equation involving the p(x)-Laplacian of the form (0.1) below posed in $${\mathbb {R}}^N$$ . This equation is critical in the sense that the source term has the form $$K(x)|u|^{q(x)-2}u$$ with an exponent q that can be equal to the critical exponent $$p^*$$ at some points of $${\mathbb {R}}^N$$ including at infinity. The sufficient existence condition we find are local in the sense that they depend only on the behaviour of the exponents p and q near these points. We stress that we do not assume any symmetry or periodicity of the coefficients of the equation and that K is not required to vanish in some sense at infinity like in most existing results. The proof of these local existence conditions is based on a notion of localized best Sobolev constant at infinity and a refined concentration-compactness at infinity.

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