String inspired solution to the sign problem and overlapping problem

Masanori Hanada, Yoshinori Mastuo, Naoki Yamamoto

Research output: Contribution to journalConference articlepeer-review


Because of the sign problem, it is difficult to study finite-density QCD. In order to circumvent the sign problem, we prove that the phase-quenched approximation is exact to O(Nf/Nc) for any physical observables in a certain region of the phase diagram. We also 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-quenched approximation is good already at Nc 3, and the 1/Nc correction can be incorporated by the phase reweighting method without suffering from a severe overlap problem. The same equivalence holds in effective models and holographic models. It gives us a theoretical understanding of the empirical facts (exactness of the phase quenching in the mean-field approximation) found in model calculations.

Original languageEnglish
Article number012008
JournalJournal of Physics: Conference Series
Issue number1
Publication statusPublished - 2013
Externally publishedYes
Event10th Extreme QCD 2012, xQCD 2012 - Washington, DC, United States
Duration: 2012 Aug 212012 Aug 23

ASJC Scopus subject areas

  • General Physics and Astronomy


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