Project A06
Dynamics and bifurcation theory of pathwise SPDEs

Project description

The project aims to analyze the asymptotic behavior of rough and singular stochastic partial differential equations, especially at bifurcations, using finite-time Lyapunov exponents and amplitude equations for bifurcation analysis. It also develops a theory of attractors and investigates the convergence speed to invariant measures, focusing on describing mixing times in hydrodynamic limits. 

Principal Investigators

Alexandra Blessing (Neamţu, U Konstanz)

Nicolas Perkowski (FU Berlin)

Project members

Mazyar Ghani Varzaneh (U Konstanz)

Xiaohan Zhu (FU Berlin)

Publications

• Agresti, A., Blessing (Neamţu), A., Luongo, E., 2025. Global well-posedness of 2D Navier–Stokes with Dirichlet boundary fractional noise. Nonlinearity 38, 075023. https://doi.org/10.1088/1361-6544/ade21c

• Ghani Varzaneh, M., Riedel, S., Schmeding, A., Tapia, N., 2025. The geometry of controlled rough paths. Stochastic Processes and their Applications 184, 104594. https://doi.org/10.1016/j.spa.2025.104594

• Blessing (Neamţu), A., Blumenthal, A., Breden, M., Engel, M., 2025. Detecting random bifurcations via rigorous enclosures of large deviations rate functions. Physica D: Nonlinear Phenomena 476, 134617. https://doi.org/10.1016/j.physd.2025.134617

• Berglund, N., Blessing (Neamţu), A., 2025. Concentration estimates for SPDEs driven by fractional Brownian motion. Electron. Commun. Probab. 30. https://doi.org/10.1214/25-ECP664

Preprints

• Blessing, A., Varzaneh, M.G., 2025. An integrable bound for semilinear rough partial differential equations with unbounded diffusion coefficients. https://doi.org/10.48550/ARXIV.2503.04415 

• Blessing, A., Varzaneh, M.G., Seitz, T., 2025. A mild rough Gronwall Lemma with applications to non-autonomous evolution equations. https://doi.org/10.48550/ARXIV.2503.03628 

• Blessing, A., Seitz, T., Sonner, S., Tang, B.Q., 2025. Pathwise mild solutions for superlinear stochastic evolution equations and their attractors. https://doi.org/10.48550/ARXIV.2502.01209 

• Varzaneh, M.G., Riedel, S., 2024. Singular stochastic delay equations driven by fractional Brownian motion: Dynamics, longtime behaviour, and pathwise stability. https://doi.org/10.48550/ARXIV.2411.04590 

Preprints prior to this CRC relevant to the project

• Blessing, A., Rosati, T., 2024. Quantitative instability for stochastic scalar reaction-diffusion equations. https://doi.org/10.48550/ARXIV.2406.04651