  We study the pseudogaps in the spectra of the half-filled 2D Hubbard model
using both finite-size and dynamical cluster approximation (DCA) quantum Monte
Carlo calculations. A charge pseudogap, accompanied by non-Fermi liquid
behavior in the self energy, is shown to persist in the thermodynamic limit.
The DCA (finite-size) method systematically underestimates (overestimates) the
width of the pseudogap. A spin pseudogap is not seen at half-filling.
