Multiplicity and concentration results for fractional Schrödinger-Poisson equations with magnetic fields and critical growth

Abstract: We deal with the following fractional Schr\"odinger-Poisson equation with magnetic field \begin{equation} \varepsilon^{2s}(-\Delta){A/\varepsilon}^{s}u+V(x)u+\varepsilon^{-2t}(|x|^{2t-3}|u|^{2})u=f(|u|^{2})u+|u|^{2^{}{s}-2}u \quad \mbox{in} \mathbb{R}^{3}, \nonumber \end{equation} where $\varepsilon>0$ is a small parameter, $s\in (\frac{3}{4}, 1)$, $t\in (0,1)$, $2^{*}_{s}=\frac{6}{3-2s}$ is the fractional critical exponent, $(-\Delta)^{s}_{A}$ is the fractional magnetic Laplacian, $V:\mathbb{R}^{3}\rightarrow \mathbb{R}$ is a positive continuous potential, $A:\mathbb{R}^{3}\rightarrow \mathbb{R}^{3}$ is a smooth magnetic potential and $f:\mathbb{R}\rightarrow \mathbb{R}$ is a subcritical nonlinearity. Under a local condition on the potential $V$, we study multiplicity and concentration of nontrivial solutions as $\varepsilon\rightarrow 0$. In particular, we relate the number of nontrivial solutions with the topology of the set where the potential $V$ attains its minimum.