On the Pointwise Convergence of Solutions to the Schrödinger Equation Along Certain Highly Tangential Curves

We investigate the Sobolev regularity required for almost everywhere convergence to the initial datum of solutions to the linear Schrödinger equation along certain tangential curves. In the regime $\alpha <\frac{1}{2}$, we analyze maximal estimates for expressions of the form $e^{it\mathrm{\Delta }}f(x+\gamma (t))$ over specific $\alpha$-Hölder curves $\gamma$ and initial data $f\in H^s({\mathbb{R}}^n)$. For the model family $\gamma (t)=(t^{{\alpha }_1},\dots ,t^{{\alpha }_n})$, where $\alpha ={\min }_j{\alpha }_j$, we show that the critical regularity is $s=\max \{\frac{1-2\alpha }{2},\frac{n}{2(n+1)}\}\mathrm{.}$