### Abstract

Finite-density QCD is difficult to study numerically because of the sign problem. We prove that, in a certain region of the phase diagram, the phase quenched approximation is exact to O(Nf =Nc). It is true for any physical observables. We also consider the implications for the lattice simulations and find a quantitative evidence for the validity of the phase quenching from existing lattice QCD results at Nc = 3. Our results show that the phase-quench approximation is rather good already at Nc = 3, and the 1=Nc correction can be incorporated by the phase reweighting method without suffering from the overlap problem. We also show the same equivalence in effective models and holographic models.

Original language | English |
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Article number | 064 |

Journal | Proceedings of Science |

Volume | Part F130497 |

Publication status | Published - 2012 |

Externally published | Yes |

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### ASJC Scopus subject areas

- General

### Cite this

*Proceedings of Science*,

*Part F130497*, [064].