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# 36th Annual International Symposium on Lattice Field Theory

22-28 July 2018
Kellogg Hotel and Conference Center
EST timezone

## Can the complex Langevin method see the deconfinement phase transition in QCD at finite density?

Jul 23, 2018, 2:20 PM
20m
Centennial (Kellogg Hotel and Conference Center)

### Centennial

#### Kellogg Hotel and Conference Center

219 S Harrison Rd, East Lansing, MI 48824
Nonzero Temperature and Density

### Speaker

Dr Shoichiro Tsutsui (High Energy Accelerator Research Organization)

### Description

Exploring the phase diagram of QCD at finite density is a challenging problem since first-principle calculations based on standard Monte Carlo methods suffer from the sign problem. As a promising approach to this issue, the complex Langevin method (CLM) has been pursued intensively. In this talk, we investigate the applicability of the CLM in the vicinity of the deconfinement phase transition using the four-flavor staggered fermions. A previous study on a $16^3 \times 8$ lattice showed that the CLM fails at $\beta<5.15$ due to the excursion problem, which made the transition to the confined phase inaccessible. In this study, we employ a lattice with larger temporal size in order to make the CLM work at lower temperature. In particular, we investigate the $\beta$-dependence of the chiral condensate to look for a hysteresis which signals the expected first order phase transition.

### Primary author

Dr Shoichiro Tsutsui (High Energy Accelerator Research Organization)

### Co-authors

Prof. Asato Tsuchiya (Shizuoka Univ.) Dr Hideo Matsufuru (KEK) Prof. Jun Nishimura (KEK) Dr Shinji Shimasaki (KEK) Dr Yuta Ito (KEK)

 Slides