Bloch, J. and Glesaaen, J. and Verbaarschot, J. J. M. and Zafeiropoulos, S. (2018) Complex Langevin simulation of a random matrix model at nonzero chemical potential. JOURNAL OF HIGH ENERGY PHYSICS (3): 015. ISSN 1029-8479,
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In this paper we test the complex Langevin algorithm for numerical simulations of a random matrix model of QCD with a first order phase transition to a phase of finite baryon density. We observe that a naive implementation of the algorithm leads to phase quenched results, which were also derived analytically in this article. We test several fixes for the convergence issues of the algorithm, in particular the method of gauge cooling, the shifted representation, the deformation technique and reweighted complex Langevin, but only the latter method reproduces the correct analytical results in the region where the quark mass is inside the domain of the eigenvalues. In order to shed more light on the issues of the methods we also apply them to a similar random matrix model with a milder sign problem and no phase transition, and in that case gauge cooling solves the convergence problems as was shown before in the literature.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | FINITE-DENSITY; DIRAC OPERATOR; LATTICE QCD; Lattice QCD; Lattice Quantum Field Theory; Matrix Models |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Braun > Group Tilo Wettig |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 20 Mar 2020 10:23 |
| Last Modified: | 20 Mar 2020 10:23 |
| URI: | https://pred.uni-regensburg.de/id/eprint/14907 |
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