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Renormalization group, dimer-dimer scattering, and three-body forces

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arxiv 0911.4608 v2 pith:WNUWJBBT submitted 2009-11-24 cond-mat.quant-gas nucl-thphysics.atom-ph

classification cond-mat.quant-gasnucl-thphysics.atom-ph
keywords scatteringdependencedimer-dimerlengthrenormalisationthree-bodyactionadding
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We study the ratio between the fermion-fermion scattering length and the dimer-dimer scattering length for systems of nonrelativistic fermions, using the same functional renormalisation technique as previously applied to fermionic matter. We find a strong dependence on the cutoff function used in the renormalisation flow for a two-body truncation of the action. Adding a simple three-body term substantially reduces this dependence.

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