A pathological set regarding the propagation of almost sure properties of Gaussian measures

Abstract

We provide a complementary result to the quasi-invariance of Gaussian measures supported on Sobolev spaces with high regularity under the dynamics of the three-dimensional periodic defocusing nonlinear wave equation from Gunaratnam-Oh-Tzvetkov-Weber (2022). Namely, given $p$ and $σ$ large enough, we prove the existence of dense sets of Sobolev spaces $W^{σ,p}(\mathbb{T}^3)$ which do not preserve the regularity $σ$ throughout the aforementioned dynamics. This is in sharp contrast with the propagation under the flow of almost sure properties.