Giulia Betelli
Physics Informed Neural Networks for the study of the HCIZ integral.
Rel. Alfredo Braunstein, Sergio Chibbaro. Politecnico di Torino, Master of science program in Physics Of Complex Systems, 2026
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Abstract
Computation of the Harish–Chandra–Itzykson–Zuber (HCIZ) integral appears as a theoretical bottleneck in many areas of theoretical physics and mathematics, from matrix models for Quantum Chromodynamics, to stochastic resetting problems and Free Probability Theory. Knowledge of its asymptotic expansion, which is notoriously hard to estimate, would be extremely useful. Recently, a hydrodynamic mapping of the problem giving rise to a set of coupled PDEs has been proposed, but their solutions are hard to obtain with standard numerical methods. This work presents the development and evaluation of ANaGRAM, a partial differential equation solver based on Physics-Informed Neural Networks (PINNs), with the explicit goal of solving the above mentioned PDEs.
The study has two main objectives: first, to provide a new computational tool for the many theoretical physics contexts in which the HCIZ integral appears; second, to use this setting as a benchmark problem for assessing the capabilities and limitations of Physics-Informed Neural Networks
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