Variational Calculations using Low-Momentum Potentials with Smooth Cutoffs
Abstract
Recent variational calculations of the deuteron and the triton illustrate that simple wave function ansatze become more effective after evolving the nucleon-nucleon potential to lower momentum (``Vlowk''). However, wave function artifacts from the use of sharp cutoffs in relative momentum decrease effectiveness for small cutoffs (< 2 fm-1) and slow down convergence in harmonic oscillator bases. These sharp cutoff artifacts are eliminated when Vlowk is generated using a sufficiently smooth cutoff regulator.
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