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One of the methods we have developed with collaborators is lattice effective field theory.  Effective field theory (EFT) is an organizing principle for the interactions of a complex system at low energies.  When applied to low-energy protons and neutrons in a formulation called chiral effective field theory, it functions as an expansion in powers of the nucleon momenta and the pion mass.  Lattice EFT combines this theoretical framework with lattice methods and Monte Carlo algorithms that are applicable to few-body systems, heavier nuclei, and infinite matter.  The Lee Research Group is part of the Nuclear Lattice EFT Collaboration, which has pioneered many of the theoretical ideas and methods now being used in lattice EFT calculations.

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