QCD phase diagram at strong coupling including auxiliary field fluctuations
High Energy Physics - Lattice
2013-11-22 v1
Abstract
We investigate the phase diagram and the mechanism for the sign problem to appear in finite density QCD at strong coupling in a combined framework of the auxiliary field Monte-Carlo (AFMC) and the chiral angle fixing (CAF) methods. When bosonizing meson hopping terms in the effective action, we need to introduce imaginary number coefficients, which leads to a complex phase in numerical simulations. By using the cut-off technique, we quantitatively show that high momentum modes of auxiliary fields mainly contribute to the weight cancellation; Cutting-off high-momentum auxiliary field modes does not modify order parameters but suppresses statistical weight cancellation, when we choose the cut-off parameter appropriately.
Cite
@article{arxiv.1311.5352,
title = {QCD phase diagram at strong coupling including auxiliary field fluctuations},
author = {Terukazu Ichihara and Takashi Z. Nakano and Akira Ohnishi},
journal= {arXiv preprint arXiv:1311.5352},
year = {2013}
}
Comments
7 pages, 3 figures