The One-Center Point Interaction in Three Dimensions
In this section we develop a precise formulation for the point interaction (also called δ, or zero-range, or contact interaction or Fermi pseudopotential in the physics literature) centered at a fixed point y in three dimensions. Although our methods concentrate mainly on the concept of self-adjoint operator extensions, an alternative approach based on local Dirichlet forms is sketched at the end of the section.
KeywordsPoint Interaction Nonlocal Interaction Resonance Pair Effective Range Expansion Antibound State
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