Pathwise Optimal Control and Rough Fractional Hamilton-Jacobi-Bellman Equations for Rough-Fractional Dynamics

TL;DR

This paper develops a rough path-based framework incorporating fractional calculus to analyze pathwise control problems with low-regularity noise, extending existing theories to broader classes of stochastic dynamics.

Contribution

It introduces a novel rough fractional viscosity solution concept and extends control analysis to include broader noise classes and admissible controls.

Findings

Established conditions for non-degeneracy in rough fractional control systems

Extended fractional control analysis to rough paths with low regularity noise

Developed a new framework combining rough paths and fractional calculus

Abstract

We use a rough path-based approach to investigate the degeneracy problem in the context of pathwise control. We extend the framework developed in arXiv:1902.05434 to treat admissible controls from a suitable class of H\"older continuous paths and simultaneously to handle a broader class of noise terms. Our approach uses fractional calculus to augment the original control equation, resulting in a system with added fractional dynamics. We adapt the existing analysis of fractional systems from the work of Gomoyunov arXiv:1908.01747, arXiv:2111.14400v1 , arXiv:2109.02451 to this new setting, providing a notion of a rough fractional viscosity solution for fractional systems that involve a noise term of arbitrarily low regularity. In this framework, following the method outlined in arXiv:1902.05434, we derive sufficient conditions to ensure that the control problem remains non-degenerate.