A new type of bubble solutions for a critical fractional Schr\"{o}dinger equation

We consider the following critical fractional Schr\"{o}dinger equation \begin{equation*} (-\Delta)^s u+V(|y'|,y'')u=u^{2_s^*-1},\quad u>0,\quad y =(y',y'') \in R^3\times R^{N-3}, \end{equation*} where $N\geq 3,s\in(0,1)$, $2_s^*=\frac{2N}{N-2s}$ is the fractional critical Sobolev exponent and $V(|y'|,y'')$ is a bounded non-negative function in $R^3\times R^{N-3}$. If $r^{2s}V(r,y'')$ has a stable critical point $(r_0,y_0'')$ with $r_0>0$ and $V(r_0,y_0'')>0$, by using a modified finite-dimensional reduction method and various local Pohozaev identities, we prove that the problem above has a new type of infinitely many solutions which are different from those obtained in \cite{guo2020solutions}. And the concentration points of the bump solutions include saddle points of the function $r^{2s}V(r,y'')$. We cleverly choose one of the reduced parameters $\bar{h}$ which depends on the scaling parameter $\lambda$ and avoid to compute the reduced functional with respect to $\bar{h}$ directly. Also we overcome some difficulties caused by the fractional Laplacian.