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This paper derives sharp local-in-time dispersive and global Strichartz estimates for the semiclassical Schrödinger equation in a 3D cylindrical domain with Neumann boundary conditions. The analysis leverages semiclassical microlocal analysis, oscillatory integral estimates, and a modified Airy-Poisson summation formula to handle persistent glancing interactions and the spectral implications of Neumann reflection. The resulting estimates provide a uniform linear framework for the cubic nonlinear Schrödinger equation, proving local well-posedness in $H^s(\Omega)$ for $s>1$.
Persistent glancing interactions in cylindrical domains fundamentally alter Schrödinger dispersion, requiring novel spectral analysis and summation formulas to derive sharp Strichartz estimates.
We establish sharp local-in-time dispersive estimates and global Strichartz estimates for the semiclassical Schr\"odinger equation in a three-dimensional cylindrical domain $\Omega\subset\mathbb{R}^{3}$ with homogeneous Neumann boundary conditions. The partially flat boundary leads to a degeneracy of curvature in the longitudinal direction and produces persistent glancing interactions that distinguish the cylindrical setting from strictly convex domains. At the spectral level, the Neumann condition is reflected in the appearance of the zeros of the Airy derivative in place of the Airy zeros associated with Dirichlet boundary conditions. Using semiclassical microlocal analysis, oscillatory integral estimates, and an Airy--Poisson summation formula adapted to Neumann reflection, we obtain uniform dispersive bounds for the localized Schr\"odinger propagator. The quadratic structure of the Schr\"odinger phase yields a uniform treatment of the low-frequency regime and, combined with the boundary-layer analysis, leads to global Strichartz estimates with derivative loss $$ \rho(q)=\frac{3}{2}\left(\frac12-\frac1q\right). $$ As an application, we prove local well-posedness in $H^{s}(\Omega)$, $s>1$, for the cubic nonlinear Schr\"odinger equation with either focusing or defocusing sign and homogeneous Neumann boundary conditions. These results quantify the effect of partially flat boundary geometry on Schr\"odinger dispersion and provide a sharp linear framework for the corresponding nonlinear dynamics.