Functional renormalization group approach to the four-body problem
R. Schmidt1a and S. Moroz2
Physik Department, Technische Universität München,
2 Institut für Theoretische Physik, Universität Heidelberg, Philosophenweg 16, D-69120 Heidelberg, Germany
a e-mail: email@example.com
Published online: 12 April 2010
We present a renormalization group analysis of the non-relativistic four-boson problem by means of a simple model with pointlike three- and four-body interactions. We investigate in particular the unitarity point where the scattering length is inﬁnite and all energies are at the atom threshold. We ﬁnd that the four-body problem behaves truly universally, independent of any four-body parameter conﬁrming the ﬁndings of Platter et al. and von Stecher et al. [1–3].
© Owned by the authors, published by EDP Sciences, 2010