2013, Barrios, Begoña, Peral, Ireneo, Soria, Fernando, Valdinoci, Enrico

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2014, Dipierro, Serena, Medina, Maria, Peral, Ireneo, Valdinoci, Enrico

In this paper we study some nonlinear elliptic equations obtained as a perturbation of the problem with the fractional critical Sobolev exponent. To construct solutions to this equation, we use the Lyapunov-Schmidt reduction, that takes advantage of the variational structure of the problem. Some cases of the parameter range are particularly difficult, due to the lack of regularity of the associated energy functional, and we need to introduce a new functional setting and develop an appropriate fractional elliptic regularity theory.