High-degree cubature on Wiener space through unshuffle expansions

Utilizing classical results on the structure of Hopf algebras, we develop a novel approach for the construction of cubature formulae on Wiener space based on unshuffle expansions.We demonstrate the effectiveness of this approach by constructing the first degree-7 cubature formula on d-dimensional Wiener space with drift in the sense of Lyons and Victoir (Lyons & Victoir 2004 Stoch.Anal.Appl.Math.Finance 460, which is explicit as a function of an underlying Gaussian cubature.The support of our degree-7 formula is significantly smaller than that of currently implemented or proposed constructions.