Paper: arXiv 2509.09585

Authors: Alejandro Rodriguez Dominguez

Abstract

Classical portfolio models tend to degrade under structural breaks, whereas flexible machine-learning allocators often lack arbitrage consistency and interpretability. We propose Causal PDE-Control Models (CPCMs), a framework that links structural causal drivers, nonlinear filtering, and forward-backward PDE control to produce robust, transparent allocation rules under partial information. The main contributions are: (i) construction of scenario-conditional risk-neutral measures on the observable filtration via filtering, with an associated martingale representation; (ii) a projection-divergence duality that quantifies stability costs when deviating from the causal driver span; (iii) a causal completeness condition showing when a finite driver span captures systematic premia; and (iv) conformal transport and smooth subspace evolution guaranteeing time-consistent projections on a moving driver manifold. Markowitz, CAPM/APT, and Black-Litterman arise as limit or constrained cases; reinforcement learning and deep hedging appear as unconstrained approximations once embedded in the same pricing-control geometry. On a U.S. equity panel with 300+ candidate drivers, CPCM solvers achieve higher performance, lower turnover, and more persistent premia than econometric and ML benchmarks, offering a rigorous and interpretable basis for dynamic asset allocation in nonstationary markets.

Complexity vs Empirical Score

  • Math Complexity: 9.5/10
  • Empirical Rigor: 8.0/10
  • Quadrant: Holy Grail — high math complexity, high empirical rigor

Why this score: The paper employs advanced PDEs, nonlinear filtering, and stochastic calculus at a high density, scoring near the top for math complexity. It also presents a substantial empirical study on a 300+ driver U.S. equity panel with specific performance metrics, indicating strong data and implementation focus.

Research Flowchart

  flowchart TD
  A["Research Goal: Robust Adaptive Allocation under Partial Info"] --> B["Methodology: Causal PDE-Control Model<br/>Causal Drivers + Filtering + PDE Control"]
  B --> C["Data/Inputs: U.S. Equity Panel<br/>300+ Candidate Drivers<br/>Structural Break Regimes"]
  C --> D["Computational Process:<br/>Causal Driver Span Selection &<br/>Forward-Backward PDE Solver"]
  D --> E["Key Findings/Outcomes:<br/>1. Consistency via Causal Completeness<br/>2. Stability via Projection-Divergence Duality<br/>3. High Performance, Low Turnover<br/>4. Interpretable Limits (Markowitz, Black-Litterman)"]

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3 of 447 cited works are in the corpus; resolved via arXiv source bundles, Semantic Scholar and OpenAlex. Corpus-wide: 2518 linked papers.