**Gauge cooling for the singular-drift problem in the complex Langevin method - an application to finite density QCD**

*K. Nagata, H. Matsufuru, J. Nishimura, S. Shimasaki*

in 34th annual International Symposium on Lattice Field Theory

Contribution: pdf

**Abstract**

We study full QCD at finite density and low temperature

with light quark mass using the complex Langevin method.

Since the singular drift problem turns out to be mild

on a $4^3 \times 8$ lattice we use,

the gauge cooling is performed only to control the unitarity norm

in this exploratory study.

We report on our preliminary data obtained

from the complex Langevin simulation up to certain Langevin time.

While the data are still noisy due to lack of statistics,

the onset of the baryon number density seems to occur

at larger $\mu$ than half the pion mass, which is

the value for the phase quenched QCD.

The validity of our simulation is tested by

the recently proposed criterion based on

the probability distribution of the drift term.