Franziska Bielert | Searcharxiv

arXiv2025

Causal Hamilton-Jacobi-Bellman Equations for Anticipative Stochastic Optimal Control

We consider a stochastic optimal control problem where the controller can anticipate the evolution of the driving noise over some dynamically changing time window. The controlled state dynamics are understood as a rough differential equation. We combine the martingale optimality principle with a functional form of Itô's formula to derive a Hamilton-Jacobi-Bellman (HJB) equation for this problem. This HJB equation is formulated in terms of Dupire's functional derivatives and involves a transport equation arising from the anticipativity of the problem.

math.OC↗

arXiv2025

Rough Functional Itô Formula

We prove a rough Itô formula for path-dependent functionals of $α$-Hölder continuous paths for $α\in(0,1)$. Our approach combines the sewing lemma and a Taylor approximation in terms of path-dependent derivatives.

math.PR↗