Existence and concentration of solution for a class of fractional Hamiltonian systems with subquadratic potential

Abstract

This article study the fractional Hamiltonian systems \begin{eqnarray}\label{00} {_{t}}D_{\infty}^α({_{-\infty}}D_{t}^αu) + λL(t)u = \nabla W(t, u), \;\;t\in \mathbb{R}, \end{eqnarray} where $\alpha \in (1/2,1)$, $\lambda >0$ is a parameter, $L\in C(\mathbb{R},{\mathbb{R}}^{n\times n})$ and $W\in C^1(\mathbb{R}\times {\mathbb{R}}^n,\mathbb{R})$. Unlike most other papers on this problem, we require that $L(t)$ is a positive semi-definite symmetric matrix for all $t\in \mathbb{R}$, that is, $L(t)\equiv 0$ is allowed to occur in some finite interval $\mathbb{I}$ of $\mathbb{R}$. Under some mild assumptions on $W$, we establish the existence of nontrivial weak solution, which vanish on $\mathbb{R}\setminus \mathbb{I}$ as $\lambda \to \infty ,$ and converge to $\tilde{u}$ in $H^{\alpha }(\mathbb{R})$; here $\tilde{u}\in E_0^{\alpha }$ is nontrivial weak solution of the Dirichlet BVP for fractional Hamiltonian systems on the finite interval $\mathbb{I}$.

arXiv admin note: text overlap with arXiv:1409.0765