Few-Body Systems

, Volume 51, Issue 2, pp 153–180

Efimov Physics from the Functional Renormalization Group

  • Stefan Floerchinger
  • Sergej Moroz
  • Richard Schmidt
Article

DOI: 10.1007/s00601-011-0231-z

Cite this article as:
Floerchinger, S., Moroz, S. & Schmidt, R. Few-Body Syst (2011) 51: 153. doi:10.1007/s00601-011-0231-z

Abstract

Few-body physics related to the Efimov effect is discussed using the functional renormalization group method. After a short review of renormalization in its modern formulation we apply this formalism to the description of scattering and bound states in few-body systems of identical bosons and distinguishable fermions with two and three components. The Efimov effect leads to a limit cycle in the renormalization group flow. Recently measured three-body loss rates in an ultracold Fermi gas of 6Li atoms are explained within this framework. We also discuss briefly the relation to the many-body physics of the BCS–BEC crossover for two-component fermions and the formation of a trion phase for the case of three species.

Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Stefan Floerchinger
    • 1
    • 2
  • Sergej Moroz
    • 1
  • Richard Schmidt
    • 3
  1. 1.Institut für Theoretische PhysikHeidelbergGermany
  2. 2.Physics DepartmentTheory Unit, CERNGeneva 23Switzerland
  3. 3.Physik DepartmentTechnische Universität MünchenGarchingGermany