Monte Carlo calculation of dynamical properties of the two-dimensional Hubbard model

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Abstract
A new method is introduced for analytically continuing imaginary-time data from quantum Monte Carlo calculations to the real-frequency axis. The method is based on a least-squares fitting procedure with constraints of positivity and smoothness on the real-frequency quantities. Results are shown for the single-particle spectral-weight function and density of states for the half-filled two-dimensional Hubbard model.