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Diagonal Frog: high-order FD schemes preserve positivity in anisotropic Fokker-Planck

Computational technique (Diagonal Frog) for solving Fokker-Planck equations in multi-dimensional spaces with cross-diffusion, guaranteeing non-negative probability densities. Avoids numerical artifacts in monte-carlo risk engines.

WHY IT MATTERS

Risk and valuation systems solving PDEs (e.g., stochastic volatility calibration, CVA Monte Carlo) suffer from unphysical negative probabilities; this scheme eliminates that class of error without sacrificing accuracy.

Source: arXiv · 2026-06-24

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Diagonal Frog: high-order FD schemes preserve positivity in anisotropic Fokker-Planck — ath — AITechHive