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We studied the superfluid-to-Mott insulator transition for bosonic hardspheres loaded in asymmetric three-dimensional optical lattices by means ofdiffusion Monte Carlo calculations. The onset of the transition was monitoredthrough the change in the chemical potential around the density correspondingto one particle per potential well. With this method, we were able to reproducethe results given in the literature for three-dimensional symmetric latticesand for systems whose asymmetry makes them equivalent to a set of quasi-onedimensional tubes. The location of the same transition for asymmetric systemsakin to a stack of quasi-two dimensional lattices will be also given. Ourresults were checked against those given by a Bose-Hubbard model for similararrangements.

Zero-temperature phase diagram of hard sphere bosons in asymmetric three dimensional optical lattices