New Periodic Solutions for N-Body Problems with Weak Force Potentials
In this paper, we apply a variant of the famous Mountain Pass Lemmas of Ambrosetti-Rabinowitz ([5]) and Ambrosetti-Coti Zelati ([2]) with (CPS)c type condition of Cerami-Palais-Smale ([12]) to study the existence of new periodic solutions with a prescribed energy for N-body problems with weak force type potentials.