A Sobolev rough path extension theorem via regularity structures

¹ Shanghai Tech University, Shanghai, China
² Universität Mannheim, Mannheim, Germany
³ Eidgenössische Technische Hochschule Zürich, Zurich, Switzerland

^* Corresponding author: proemel@uni-mannheim.de

Received: 8 April 2022
Accepted: 9 November 2022

Abstract

We show that every ℝ^d-valued Sobolev path with regularity a and integrability p can be lifted to a Sobolev rough path provided 1/2 > α > 1/p> ⋁ 1/3. The novelty of our approach is its use of ideas underlying Hairer’s reconstruction theorem generalized to a framework allowing for Sobolev models and Sobolev modelled distributions. Moreover, we show that the corresponding lifting map is locally Lipschitz continuous with respect to the inhomogeneous Sobolev metric.