Acta mathematica scientia,Series B ›› 2023, Vol. 43 ›› Issue (3): 1195-1210.doi: 10.1007/s10473-023-0312-3

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HOMOCLINIC SOLUTIONS NEAR THE ORIGIN FOR A CLASS OF FIRST ORDER HAMILTONIAN SYSTEMS*

Qingye Zhang1, Chungen Liu2,†   

  1. 1. School of Mathematics and Statistics, Jiangxi Normal University, Nanchang 330022, China;
    2. School of Mathematics and Information Science, Guangzhou University, Guangzhou 510006, China
  • Received:2021-09-29 Online:2023-06-25 Published:2023-06-06
  • Contact: Chungen Liu, E-mail: liucg@nankai.edu.cn
  • About author:Qingye Zhang, E-mail: zhangqy@jxnu.edu.cn
  • Supported by:
    National Natural Science Foundation of China (11761036, 11201196) and the Natural Science Foundation of Jiangxi Province (20171BAB211002); The second author was supported by the National Natural Science Foundation of China (11790271, 12171108), the Guangdong Basic and Applied basic Research Foundation (2020A1515011019), the Innovation and Development Project of Guangzhou University, and the Nankai Zhide Foundation.

Abstract: In this paper, we study the existence of infinitely many homoclinic solutions for a class of first order Hamiltonian systems $\dot{z}=JH_z(t,z)$, where the Hamiltonian function $H$ possesses the form $H(t,z)=\frac{1}{2}L(t)z\cdot z +G(t,z)$, and $G(t,z)$ is only locally defined near the origin with respect to $z$. Under some mild conditions on $L$ and $G$, we show that the existence of a sequence of homoclinic solutions is actually a local phenomenon in some sense, which is essentially forced by the subquadraticity of $G$ near the origin with respect to $z$.

Key words: Hamiltonian systems, homoclinic solutions, variational method

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