Fast & accurate emulation of two-body scattering observables without wave functions
Abstract
We combine Newton's variational method with ideas from eigenvector continuation to construct a fast & accurate emulator for two-body scattering observables. The emulator will facilitate the application of rigorous statistical methods for interactions that depend smoothly on a set of free parameters. Our approach begins with a trial or matrix constructed from a small number of exact solutions to the Lippmann--Schwinger equation. Subsequent emulation only requires operations on small matrices. We provide several applications to short-range potentials with and without the Coulomb interaction and partial-wave coupling. It is shown that the emulator can accurately extrapolate far from the support of the training data. When used to emulate the neutron-proton cross section with a modern chiral interaction as a function of 26 free parameters, it reproduces the exact calculation with negligible error and provides an over 300x improvement in CPU time.
Keywords
Cite
@article{arxiv.2106.15608,
title = {Fast & accurate emulation of two-body scattering observables without wave functions},
author = {J. A. Melendez and C. Drischler and A. J. Garcia and R. J. Furnstahl and Xilin Zhang},
journal= {arXiv preprint arXiv:2106.15608},
year = {2021}
}
Comments
9 pages, 6 figures; minor updates, close to published version