Quantitative Brownian regularity of the KPZ fixed point with meagre initial data
Pantelis Tassopoulos, Sourav Sarkar
Published: 2025/9/23
Abstract
We show that the spatial increments of the KPZ fixed point starting from initial data that is locally bounded and whose support admits $\epsilon$-coverings with moderate growth, exhibit strong quantitative comparison against rate two Brownian motion on compacts. The above estimates are uniform on the $L^p$ norms, the compact set containing the support of the initial data and the length of the interval considered.