Low-energy nuclear physics for fundamental science

While the Standard Model is an extremely successful theory, there are beyond the Standard Model (BSM) phenomena that cannot be accounted for in the present framework. Searches for new BSM physics contributions can involve going to high energies, or looking very precisely for deviations from known physics. At both frontiers, there are experiments where nuclei are the active material. To disentangle new physics from nuclear effects in these experiments, precise nuclear theory calculations are needed. In this talk, I will discuss quantum Monte Carlo approaches to solve the nuclear many-body problem, and will focus on examples of calculations from precision beta decay and high energy lepton-nucleus scattering.