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We solve the sign problem in a particle-hole symmetric spin-polarized fermionmodel on bipartite lattices using the idea of fermion bags. The solution can beextended to a class of models at half filling but without particle-holesymmetry. Attractive Hubbard models with an odd number of fermion species canalso be solved. The new solutions should allow us to study quantum phasetransitions that have remained unexplored so far due to sign problems.

Solution to sign problems in half-filled spin-polarized electronic systems