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Theory Center Seminar <br>
Monday, May 2, 2011 <br>
1:00 p.m. (coffee at 12:45 p.m.) <br>
CEBAF Center, <b>Room F224/225</b><br>
<br>
Olga Goulko <br>
University of Cambridge, U.K. <br>
<br>
<b><span>*</span>The Imbalanced Fermi Gas at Unitarity<span>*</span></b>
<br>
<br>
Lattice field theory is a useful tool for studying strongly
interacting <br>
theories in condensed matter physics. A prominent example is the
unitary <br>
Fermi gas: a two-component system of fermions interacting with
divergent <br>
scattering length. With Monte Carlo methods this system can be
studied <br>
from first principles. In the presence of an imbalance (unequal
number of <br>
particles in the two components) a sign problem arises, which makes
<br>
conventional algorithms inapplicable. I will show how to apply <br>
reweighting techniques to generalize the recently developed worm
algorithm to the <br>
imbalanced case, and present results for the critical temperature
and <br>
other thermodynamic observables at the critical point, namely the
chemical <br>
potential, the energy per particle and the contact density. I will
also <br>
present some preliminary results for these observables at
temperatures <br>
beyond the critical point.
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