Efficient emulator for solving three-nucleon continuum Faddeev equations with chiral three-nucleon force comprising any number of contact terms

TL;DR

This paper introduces a fast computational emulator for three-nucleon continuum calculations using chiral forces, significantly reducing computation time while maintaining high accuracy for various contact term configurations.

Contribution

The authors develop an emulator that solves N+1 Faddeev equations for N contact terms, enabling rapid predictions of three-nucleon observables with high precision.

Findings

Reduces computational workload for three-nucleon force calculations

Accurately reproduces exact results for nucleon-deuteron scattering

Enables quick exploration of different contact term strengths

Abstract

We demonstrate a computational scheme which drastically decreases the required time to get theoretical predictions based on chiral two- and three-nucleon forces for observables in three-nucleon continuum. For a three-nucleon force containing N short-range terms all workload is reduced to solving N+1 Faddeev-type integral equations. That done, computation of observables for any combination of strengths of the contact terms is done in a flash. We demonstrate on example of the elastic nucleon-deuteron scattering observables the high precision of the proposed emulator and its capability to reproduce exact results.