Mapping Gluon PDFs with Diffractive Vector Meson Leptoproduction at eRHIC

Here we compare predictions for diffractive vector meson production from two different non-perturbative saturating dipole models both with each other and with perturbative QCD for both $e+p$ and $e+A$ and study their sensitivity to the gluon PDF $g(x,Q^{2})$. We also discuss opportunities for studying gluon PDFs with diffractive physics at a future Electron Ion Collider.