New existence and multiplicity of homoclinic solutions for second order non-autonomous systems

摘要

In this paper, we study the second order non-autonomous system egin{eqnarray*} ddot{u}(t)+Adot{u}(t)-L(t)u(t)+abla W(t,u(t))=0, orall tinmathbb{R}, end{eqnarray*} where $A$ is an antisymmetric $Nimes N$ constant matrix, $Lin C(mathbb{R},mathbb{R}^{Nimes N})$ may not be uniformly positive definite for all $tinmathbb{R}$, and $W(t,u)$ is allowed to be sign-changing and local superquadratic. Under some simple assumptions on $A$, $L$ and $W$, we establish some existence criteria to guarantee that the above system has at least one homoclinic solution or infinitely many homoclinic solutions by using mountain pass theorem or fountain theorem, respectively. Recent results in the literature are generalized and significantly improved.