C-infinity-regularization by Noise of Singular ODE's

Abstract

In this paper we construct a new type of noise of fractional nature that has a strong regularizing effect on differential equations. We consider an equation with this noise with a highly irregular coefficient. We employ a new method to prove existence and uniqueness of global strong solutions where classical methods fail because of the ”roughness” and non-Markovianity of the driving process. In addition, we prove the rather remarkable property that such solutions are infinitely many times classically differentiable with respect to the initial condition in spite of the vector field being discontinuous. This opens a fundamental question on studying certain classes of interesting partial differential equations perturbed by this noise.