Functional inequalities for a family of infinite-dimensional diffusions with degenerate noise

For a family of infinite-dimensional diffusions with degenerate noise, we develop a modified $\mathrm{\Gamma }$ calculus on finite-dimensional projections of the equation in order to produce explicit functional inequalities that can be scaled to infinite dimensions. The choice of our $\mathrm{\Gamma }$ operator appears canonical in our context, as the estimates depend only on the induced control distance. We apply the general analysis to a number of examples, exploring implications for quasi-invariance and uniqueness of stationary distributions.