Recent progress in fermion Monte Carlo

Our approach to the solution of the Schroedinger Equation for many-fermion systems has been extensively revised. We have devised a generalization of ''acceptance/rejection'' that applies to signed random walkers. We have introduced a new class of importance functions for two walkers that better reflects the structure of the enlarged Euclidean space of the pair. For greater flexibility, we no longer rely on the ''local energy'' of the importance function to determine the dynamics of the walk. We sketch these technical changes and give new results for the two-dimensional electron gas.