2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/221534We show that the convergence behavior of the many-body numerical diagonalization scheme for strongly interacting bosons in a trap can be significantly improved by the Lee-Suzuki method adapted from nuclear physics: One can construct an effective interaction that acts in a space much smaller than the original Hilbert space. In particular for short-ranged forces and strong correlations, the method offers a good estimate of the energy and the excitation spectrum, at a computational cost several orders of magnitude smaller than that required by the standard method.5 pages, 4 figuresOther Condensed MatterNuclear TheoryComputational Physicstext