Periodic solutions to a forced Kepler problem in the plane

A. Boscaggin, W. Dambrosio, D. Papini

Given a smooth function $U(t,x)$, $T$-periodic in the first variable and satisfying $U(t,x)=\mathcal{O}(|x{|}^{\alpha })$ for some $\alpha \in (0,2)$ as $|x|\to \infty$, we…