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

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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 renormalization technique as previously applied to fermionic matter. We find a strong dependence on the cutoff function used in the renormalization flow for a two-body truncation of the action. Adding a simple three-body term substantially reduces this dependence. © 2010 The American Physical Society.
    Original languageEnglish
    Article number043628
    JournalPhysical Review A
    Issue number4
    Publication statusPublished - 26 Apr 2010


    • Condensed Matter - Quantum Gases
    • Nuclear Theory
    • Physics - Atomic Physics


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