English

Singular SPDEs with the Cauchy-Riemann operator on a torus

Probability 2025-09-29 v2 Analysis of PDEs

Abstract

We prove the existence of solution to the following C3\mathbb{C}^3-valued singular SPDE on the 2D torus T2\mathbb{T}^2: \begin{align} \label{CR} \partial_{\bar z} r = r \times \overline{r} + i \, \gamma \, {\mathscr W}, \tag{CR} \end{align} where zˉ:=12(x+iy)\partial_{\bar z}: = \frac12(\partial_x + i \partial_y) is the Cauchy-Riemann operator on T2\mathbb{T}^2, W=(W1,W2,W3){\mathscr W} = ({\scriptstyle {\mathscr W}_1}, {\scriptstyle {\mathscr W}_2}, {\scriptstyle {\mathscr W}_3}) is a real 3D white noise on T2\mathbb{T}^2 whose component W3{\scriptstyle {\mathscr W}_3} has zero mean over T2\mathbb{T}^2, γ:=(γ1,γ2,γ3)\gamma: = (\gamma_1,\gamma_2,\gamma_3) is an R3\mathbb{R}^3-vector and γW:=(γ1W1,γ2W2,γ3W3)\gamma \, {\mathscr W}: = (\gamma_1 {\scriptstyle {\mathscr W}_1}, \gamma_2 {\scriptstyle {\mathscr W}_2}, \gamma_3 {\scriptstyle {\mathscr W}_3}).

Cite

@article{arxiv.2503.20075,
  title  = {Singular SPDEs with the Cauchy-Riemann operator on a torus},
  author = {Zdzisław Brzeźniak and Mikhail Neklyudov and Evelina Shamarova},
  journal= {arXiv preprint arXiv:2503.20075},
  year   = {2025}
}
R2 v1 2026-06-28T22:34:27.919Z