Multiplicity of solutions for fractional Hamiltonian systems with Liouville-Weyl fractional derivative

Abstract

In this paper, we investigate the existence of infinitely many solutions for the following fractional Hamiltonian systems: \begin{eqnarray}\label{eq00} _{t}D_{\infty}^α(_{-\infty}D_{t}^αu(t)) + L(t)u(t) = & \nabla W(t,u(t))\\ u\in H^α(\mathbb{R}, \mathbb{R}^{N}).\nonumber \end{eqnarray} where $\alpha \in (1/2,1)$, $t\in \mathbb{R}$, $u\in {\mathbb{R}}^n$, $L\in C(\mathbb{R},{\mathbb{R}}^{n^2})$ is a symmetric and positive definite matrix for all $t\in \mathbb{R}$, $W\in C^1(\mathbb{R}\times {\mathbb{R}}^n,\mathbb{R})$, and $\nabla W$ is the gradient of $W$ at $u$. The novelty of this paper is that, assuming there exists $l\in C(\mathbb{R},\mathbb{R})$ such that $(L(t)u,u)\ge l(t)|u{|}^2$ for all $t\in \mathbb{R}$, $u\in {\mathbb{R}}^n$ and the following conditions on $l$: ${\inf }_{t\in \mathbb{R}}l(t)>0$ and there exists $r_0>0$ such that, for any $M>0$ $$ m(\{t\in (y-r_{0}, y+r_{0})/\;\;l(t)\leq M\}) \to 0\;\;\mbox{as}\;\;|y|\to \infty. $$ are satisfied and $W$ is of subquadratic growth as $|u|\to +\infty$, we show that (\ref{eq00}) possesses infinitely many solutions via the genus properties in the critical theory. Recent results in [Z. Zhang and R. Yuan, Solutions for subquadratic fractional Hamiltonian systems without coercive conditions, Math. Methods Appl. Sci., DOI: 10.1002/mma.3031] are significantly improved.

References in corpus (1)

• Ground state solution for a class of differential equations with left and right fractional derivatives