Effective Field Theory for Few-Boson Systems

Understand

We study universal bosonic few-body systems within the framework of effective field theory at leading order (LO).

• We calculate binding energies of systems of up to six particles and the atom-dimer scattering length.
• Convergence to the limit of zero-range two- and three-body interactions is shown, indicating that no additional few-body interactions need to be introduced at LO.
• Generalizations of the Tjon line are constructed, showing correlations between few-body binding energies and the binding energy of the trimer, for a given dimer energy.