Derived Moduli Spaces of Nonlinear PDEs: Singular Propagations

Abstract

We construct a sheaf theoretic and derived geometric machinery to study nonlinear partial differential equations and their singular supports. We establish a notion of derived microlocalization for solution spaces of non-linear equations and develop a formalism to pose and solve singular non-linear Cauchy problems globally. Using this approach we estimate the domains of propagation for the solutions of non-linear systems. It is achieved by exploiting the fact that one may greatly enrich and simplify the study of derived non-linear PDEs over a space $X$ by studying its derived linearization which is a module over the sheaf of functions on the $S^1$-equivariant derived loop stack $\mathcal{L}X$.

We have split the previous version into three separate articles due to the invaluable comments from the anonymous referee. Accordingly, the title has also been modified to reflect this change; Updated based on referee suggestions. 117 pages