In this paper we study the existence of ground state solution for an indefinite variational problem of the typewhere N ≥ 2, V, W : R N → R and f : R N × R → R are continuous functions verifying some technical conditions and f possesses a critical growth. Here, we will consider the case where the problem is asymptotically periodic, that is, V is Z N -periodic, W goes to 0 at infinity and f is asymptotically periodic. (2010)
Mathematics Subject ClassificationsThe reader is invited to see that if J is definite strongly, that is, when E − = {0}, the set O is exactly the Nehari manifold associated with J.Hereafter, we say thatIn [25], Szulkin and Weth have established the existence of ground state solution for problem (P 1 ) by completing the study made in [20], in the sense that, they also minimize the energy function on O, however they have used more weaker conditions on f , for example f is continuous, Z N -periodic in x and satisfies |f (x, t)| ≤ C(1 + |t| p−1 ), ∀t ∈ R and x ∈ R N (f 1 )