Abstract
While the complexity of some many-body systems may stem from a profusion of distinct scales, as we approach two-body unitarity (through experimental control or as a theoretical limit) rich structures exist even though there is no more than one essential scale. I comment, from the point of view of effective field theory, on some current problems in the transition from few to many bodies in bosonic and multi-state fermion systems, where order emerges from the discrete scale invariance associated with a single, contact three-body force.
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This article belongs to the Topical Collection “30th anniversary of Few-Body Systems”.
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van Kolck, U. Unitarity and Discrete Scale Invariance. Few-Body Syst 58, 112 (2017). https://doi.org/10.1007/s00601-017-1271-9
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DOI: https://doi.org/10.1007/s00601-017-1271-9