Lattice study of QCD at finite chiral density: topology and confinement

• Published in: The European physical journal. A, Hadrons and nuclei Vol. 57; no. 1
• Main Authors: Astrakhantsev, Nikita, Braguta, V. V., Kotov, A. Yu, Kuznedelev, D. D., Nikolaev, A. A.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 2021; Springer Nature B.V
• Subjects: Chemical potential; Confinement; Density; Fermions; Hadrons; Heavy Ions; Nuclear Fusion; Nuclear Physics; Particle and Nuclear Physics; Physics; Physics and Astronomy; Quantum chromodynamics; Regular Article – Theoretical Physics; Strings; Topology
• ISSN: 1434-6001; 1434-601X
• DOI: 10.1140/epja/s10050-020-00326-2

In this paper we study the properties of QCD at nonzero chiral density ρ 5 , which is introduced through chiral chemical potential μ 5 . The study is performed within lattice simulation of QCD with dynamical rooted staggered fermions. We first check that ρ 5 is generated at nonzero μ 5 and in the chiral limit observe ρ 5 ∼ Λ QCD 2 μ 5 . We also test the possible connection between confinement and topological fluctuations. To this end, we measured the topological susceptibility χ top and string tension σ for various values of μ 5 . We observed that string tension grows with μ 5 . It seems that topological susceptibility also rises with μ 5 , but to state this more reliably the uncertainties should be reduced. We believe that our results indicate possible connection between topological fluctuations and the strength of confinement.