Phase quenching in finite-density QCD: models, holography, and lattice
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.
Keywords
Cite
@article{arxiv.1210.2438,
title = {Phase quenching in finite-density QCD: models, holography, and lattice},
author = {Masanori Hanada and Yoshinori Matsuo and Naoki Yamamoto},
journal= {arXiv preprint arXiv:1210.2438},
year = {2012}
}
Comments
Talk given at 30th International Symposium On Lattice Field Theory (Lattice 2012), Cairns Convention Centre, Cairns, Australia. v2: Reference and comment added