title: Lattice theory for low energy fermions at nonzero chemical potential.
abstract: We construct a lattice theory describing a system of interacting nonrelativistic spin s=1/2 fermions at nonzero chemical potential. The theory is applicable whenever the interparticle separation is large compared to the range of the two-body potential and does not suffer from a sign problem. In particular, the theory could be useful in studying the thermodynamic limit of fermion systems for which the scattering length is much larger than the interparticle spacing, with applications to realistic atomic systems and dilute neutron gases.
authors.affiliation: Department of Physics and National Center for Theoretical Sciences at Taipei, National Taiwan University, Taipei 10617, Taiwan. jwc@phys.ntu.edu.tw
authors.forename: Jiunn-Wei
authors.initials: JW
authors.lastname: Chen
authors.forename: David B
authors.initials: DB
authors.lastname: Kaplan