Normalized bound state solutions for the fractional Schrödinger equation with potential

In this paper, we study the following fractional Schrödinger equation with prescribed mass \begin{equation*} \left{ \begin{aligned} &(-Δ)^{s}u=λu+a(x)|u|^{p-2}u,\quad$\text{in }{\mathbb{R}}^N$,\ &\int_{$\mathbb{R}$^{N}}|u|^{2}dx=c^{2},\quad u\in H^{s}($\mathbb{R}$^{N}), \end{aligned} \right. \end{equation*} where $0<s<1$, $N>2s$, $2+\frac{4s}{N}<p<2_s^{\ast }:=\frac{2N}{N-2s}$, $c>0$, $\lambda \in \mathbb{R}$ and $a(x)\in C^1({\mathbb{R}}^N,{\mathbb{R}}^{+})$ is a potential function. By using a minimax principle, we prove the existence of bounded state normalized solution under various conditions on $a(x)$.