Jacques Bloch, Falk Bruckmann, Mario Kieburg, K. Splittorff, J. J. M. Verbaarschot
We explain the physical nature of the subset solution to the sign problem in chiral random matrix theory: The subset sum is shown to project out the canonical determinant with zero quark charge from a given configuration. As the grand canonical chiral random matrix partition function is independent of the chemical potential, the zero quark charge sector provides the full result.
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http://arxiv.org/abs/1211.3990
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