Improved Dimensionality Reduction for Inverse Problems in Nuclear Fusion and High-Energy Astrophysics
Journal:
arXiv
Published Date:
May 5, 2025
Abstract
Many inverse problems in nuclear fusion and high-energy astrophysics
research, such as the optimization of tokamak reactor geometries or the
inference of black hole parameters from interferometric images, necessitate
high-dimensional parameter scans and large ensembles of simulations to be
performed. Such inverse problems typically involve large uncertainties, both in
the measurement parameters being inverted and in the underlying physics models
themselves. Monte Carlo sampling, when combined with modern non-linear
dimensionality reduction techniques such as autoencoders and manifold learning,
can be used to reduce the size of the parameter spaces considerably. However,
there is no guarantee that the resulting combinations of parameters will be
physically valid, or even mathematically consistent. In this position paper, we
advocate adopting a hybrid approach that leverages our recent advances in the
development of formal verification methods for numerical algorithms, with the
goal of constructing parameter space restrictions with provable mathematical
and physical correctness properties, whilst nevertheless respecting both
experimental uncertainties and uncertainties in the underlying physical
processes.
