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Trapped and cooled gases of alkali atoms can be manipulated to exhibit a variety of interesting phenomena. For example, dilute gases of fermionic atoms, in 2 hyperfine states, can be cooled to temperatures where they become superfluid. An external fie ld can be applied to tune the scattering length a. When |a| exceeds the interparticle spacing, nonperturbative tools are needed to study the system theoretically. The unitary limit, |a| → ∞, is particularly interesting due to its universality and symmetry. Lattice field theory and effecti ve field theory can be used to systematically calculate properties of this system. Results are p resented for the finite temperature phase transition and for behavior near zero temperature.

Field theoretic study of a cold Fermi gas in the unitary limit