Multi-peak solutions for nonlinear Choquard equation with a general   nonlinearity
  In this paper, we study a class of nonlinear Choquard type equations involving a general nonlinearity. By using the method of penalization argument, we show that there exists a family of solutions having multiple concentration regions which concentrate at the minimum points of the potential $V$. Moreover, the monotonicity of $f(s)/s$ and the so-called Ambrosetti-Rabinowitz condition are not required. 
Minbo Yang, Jianjun Zhang, Yimin Zhang
math.AP