For a commutative ring $R$, we define the notions of deformed Picard algebroids and deformed twisted differential operators on a smooth, separated, locally of finite type $R$-scheme and prove these are in a natural bijection. We then define the pullback of a sheaf of twisted differential operators that reduces to the classical definition when $R=\mathbb{ C}$. Finally, for modules over twisted differential operators, we prove a theorem for the descent under a locally trivial torsor.
Categories: math.RA