# High-Energy Physics & RIKEN Theory Seminar

## "Field Theoretic Methods for Nonrelativistic Fermion Gases"

#### Presented by Matthew Wingate, University of Wisconsin

Wednesday, November 9, 2005, 1:30 pm — Small Seminar Room, Bldg. 510

Experiments using cold atomic gases exhibit an exciting variety of physical phenomena. This talk discusses two applications of field theory to the study of fermion gases, especially when the relevant length scale, the scattering length, has been tuned to infinity. The physics in this case is expected to be universal; however, theoretical calculations are difficult due to the absence

of a small scale about which to base a perturbative expansion. First, I discuss the lattice field theory formulation of the problem and present exploratory results of Monte Carlo simulations. Second, I introduce an effective field theory for the low energy phonon excitations suitable for calculating corrections to

superfluid hydrodynamics and Thomas-Fermi theory.

Hosted by: Shoiki Sasaki

2526 | INT/EXT | Events Calendar