Three-body interactions in Fermi systems
Abstract
We show that the contributions of three-quasiparticle interactions to normal Fermi systems at low energies and temperatures are suppressed by nq/n compared to two-body interactions, where nq is the density of excited or added quasiparticles and n is the ground-state density. For finite Fermi systems, three-quasiparticle contributions are suppressed by the corresponding ratio of particle numbers Nq/N. This is illustrated for polarons in strongly interacting spin-polarized Fermi gases and for valence neutrons in neutron-rich calcium isotopes.
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