PoS - Proceedings of Science
Volume 334 - The 36th Annual International Symposium on Lattice Field Theory (LATTICE2018) - Nonzero Temperature and Density
Exploring the phase diagram of finite density QCD at low temperature by the complex Langevin method
Y. Ito,* H. Matsufuru, J. Nishimura, S. Shimasaki, A. Tsuchiya, S. Tsutsui
*corresponding author
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Published on: May 29, 2019
Abstract
Monte Carlo studies of QCD at finite density suffer from the sign problem, which becomes easily uncontrollable as the chemical potential $\mu$ is increased even for a moderate lattice size. In this work we make an attempt to approach the high density low temperature region by the complex Langevin method (CLM) using four-flavor staggered fermions with reasonably small quark mass on a $8^3 \times 16$ lattice. Unlike the previous work on a $4^3 \times 8$ lattice, the criterion for correct convergence is satisfied within a wide range of $\mu$ without using the deformation technique. In particular, the baryon number density exhibits a plateau behavior consistent with the formation of eight baryons, and it starts to grow gradually at some $\mu$.
DOI: https://doi.org/10.22323/1.334.0146
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