A Rough Path Perspective on Renormalization

Bruned, Y
Chevyrev, I
Friz, P
Preiss, R

31 July 2019

Journal:

Journal of Functional Analysis

Last Updated:

2019-10-18T11:16:52.717+01:00

abstract:

We develop the algebraic theory of rough path translation. Particular attention is given to the case of branched rough paths, whose underlying algebraic structure (Connes-Kreimer, Grossman-Larson) makes it a useful model case of a regularity structure in the sense of Hairer. Pre-Lie structures are seen to play a fundamental rule which allow a direct understanding of the translated (i.e. renormalized) equation under consideration. This construction is also novel with regard to the algebraic renormalization theory for regularity structures due to Bruned--Hairer--Zambotti (2016), the links with which are discussed in detail.

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