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

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.

Automated summary

The computational scheme presented in this study significantly reduces the time required for theoretical predictions based on chiral two- and three-nucleon forces, particularly for observables in the three-nucleon continuum. By solving a reduced number of Faddeev-type integral equations, the workload is minimized, enabling rapid computation of observables for various combinations of contact term strengths. The proposed emulator demonstrates high precision and the ability to accurately reproduce exact results, as shown in the example of elastic nucleon-deuteron scattering observables.