Eigenvector Continuation Emulators for Chiral EFT

Full Bayesian analysis for low-energy nuclear calculations are notorious for being computationally expensive. This has motivated the development of emulators to decrease the time needed to perform uncertainty quantification (UQ). Recently, eigenvector continuation (EC) has emerged as an efficient emulator for the prediction of both bound state and scattering observables. EC is a variational technique that uses eigensolutions for several sets of known parameters to form a basis that can be used to accurately interpolate and extrapolate solutions for the same Hamiltonian with different parameters. Here we apply and test EC for the nucleon-nucleon (NN) scattering problem using a variety of chiral effective field theory potentials in momentum space. We also demonstrate an alternative emulator that does not use scattering wave functions.