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2011

Viscosity Sum Rules at Large Scattering Lengths

Goldberger, Walter D., Khandker, Zuhair U.

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We use the operator product expansion (OPE) and dispersion relations to obtain new model-independent "Borel-resummed" sum rules for both shear and bulk viscosity of many-body systems of spin-1/2 fermions with predominantly short range S-wave interactions.

These sum rules relate Gaussian weights of the frequency-dependent viscosities to the Tan contact parameter C(a).
Our results are valid for arbitrary values of the scattering length a, but receive small corrections from operators of dimension larger than 5 in the OPE, and can be used to study transport properties in the vicinity of the infinite scattering length fixed point.
In particular, we find that the exact dependence of the shear viscosity sum rule on scattering length is controlled by the function C(a).

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