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We use a diffusion Monte Carlo method to calculate the lowest energy state ofa uniform gas of bosons interacting through different model potentials, bothstrictly repulsive and with an attractive well. We explicitly verify that atlow density the energy per particle follows a universal behavior fixed by thegas parameter na^3. In the regime of densities typical for experiments intrapped Bose-condensed gases, the corrections to the mean-field energiesgreatly exceed the differences due to the details of the potential.Comment: 4 pages Latex, 4 postscript figure

Ground state of a homogeneous Bose gas: A diffusion Monte Carlo calculation