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A Bose-Hubbard model, describing bosons in a harmonic trap with asuperimposed optical lattice, is studied using a fast and accurate variationaltechnique (MF+NRG): the Gutzwiller mean-field (MF) ansatz is combined with aNumerical Renormalization Group (NRG) procedure in order to improve on both.Results are presented for one, two and three dimensions, with particularattention to the experimentally accessible momentum distribution and possiblesatellite peaks in this distribution. In one dimension, a comparison is madewith exact results obtained using Stochastich Series Expansion.Comment: 10 pages, 15 figure

Bosons confined in optical lattices: The numerical renormalization group revisited