In this paper, we study a class of nonlinear Choquard equation driven by the fractional\nLaplacian. When the potential function vanishes at infinity, we obtain the existence of a ground state\nsolution for the fractional Choquard equation by using a non-Nehari manifold method. Moreover,\nin the zero mass case, we obtain a nontrivial solution by using a perturbation method. The results\nimprove upon those in Alves, Figueiredo, and Yang (2015) and Shen, Gao, and Yang (2016).
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