Physics – Condensed Matter – Superconductivity
Scientific paper
2007-06-27
Phys.Rev.A75:053622,2007
Physics
Condensed Matter
Superconductivity
13 pages, 3 figures, version accepted for publication
Scientific paper
10.1103/PhysRevA.75.053622
We study a dynamics of ultracold Fermi-gases near the unitary limit in the framework of Effective Field Theory. It is shown that, while one can obtain a reasonable description of the universal proportionality constant both in the narrow and the broad Feshbach resonance limits, the reguirement of the reparametrisation invariance leads to appearance of the three body forces needed to cancel the otherwise arising off-shell uncertainties. The size of the unsertainties is estimated.
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