On the $L^2$-restriction norm problem for closed geodesics on the modular surface

Dana Abou Ali

Let $f$ be a Petersson normalized Hecke-Maass cusp form with spectral parameter $t\ge 2$ and let ${\mathcal{C}}_D$ be the union of closed geodesics in $\text{Sl}_{2}(\mathbb{Z})\s…