Study of properties of two color QCD at nonzero baryon density by means of lattice simulation
Seminars
Seminar on Theory of hadronic matter under extreme conditions
Date and Time: Tuesday, 27 February 2018, at 2:30 PM
Venue: Blokhintsev Hall (4th floor), Bogoliubov Laboratory of Theoretical Physics
Seminar topic: “Study of properties of two color QCD at nonzero baryon density by means of lattice simulation”
Speaker: Andrey Kotov (BLTP JINR & ITEP NRS KI)
Abstract:
Vacuum and finite temperature properties of QCD are well studied due to the method of lattice simulations. Unfortunately, in general case lattice simulations cannot be applied for QCD at nonzero baryon density due to the sign problem. In this report we present the results of lattice simulation of the theory which is free from the sign problem – two color(SU(2)) QCD at nonzero baryon density. Both SU(3) and SU(2) theories have many common phenomena and properties and study of SU(2) QCD can provide some information about the properties of real QCD. Calculations were carried out at zero temperature and with two flavors of dynamic quarks. In our study we found several phases of dense two color QCD: the hadronic phase at small chemical potential (muq); the phase of Bose-Einstein condensation of scalar diquarks at intermediate values of muq; the phase with condensation of quark Cooper pairs at large muq. At ultrahigh densities (muq~1000 MeV) we found confinement/deconfinement transition which manifests itself in rising of the Polyakov loop and vanishing of the string tension. Properties of the deconfinement phase at large densities are similar to weakly interacting gas of quarks and gluons, contrary to Quark-Gluon Plasma at large temperatures and zero baryon density.