科研之友
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摘要
We study the quantum chromodynamics phase diagram in the strong-coupling limit with fluctuation effects by using the auxiliary field Monte Carlo method. We apply the chiral angle fixing technique in order to obtain a finite chiral condensate in the chiral limit in finite volume. The behavior of the order parameters suggests that the chiral phase transition is of second-order or crossover at low chemical potential and of first order at high chemical potential. Compared with the mean-field results, the hadronic phase is suppressed at low chemical potential and is extended at high chemical potential, as already suggested in monomer-dimer-polymer simulations. We find that the sign problem originating from the bosonization procedure is weakened by the phase cancellation mechanism; a complex phase from one site tends to be canceled by the nearest-neighbor site phase as long as low-momentum auxiliary field contributions dominate.
- 出版日期2014-12
