Polarization Dynamics in Paramagnet of Charged Quark-Gluon Plasma

Abstract

It is commonly understood that the strong magnetic field produced in heavy ion collisions is short-lived. The electric conductivity of the quark-gluon plasma is unable to significantly extend the life time of magnetic field. We propose an alternative scenario to achieve this: with finite baryon density and spin polarization by the initial magnetic field, the quark-gluon plasma behaves as a paramagnet, which may continue to polarize quark after fading of initial magnetic field. We confirm this picture by calculations in both quantum electrodynamics and quantum chromodynamics. In the former case, we find a splitting in the damping rates of probe fermion with opposite spin component along the magnetic field. In the latter case, we find a similar splitting in damping rate of probe quark in quark-gluon plasma in both high density and low density limits. The splitting provides a way of polarizing strange quarks by the quark-gluon plasma paramagnet consisting of light quarks, which effectively extends the lifetime of magnetic field in heavy ion collisions.

References in corpus (17)

• Chiral Magnetic Wave
• The QCD equation of state in background magnetic fields
• Electrical conductivity and charge diffusion in thermal QCD from the lattice
• Global $\Lambda$ Polarization in high energy collisions
• Lambda hyperon polarization in relativistic heavy ion collisions from the chiral kinetic approach
• The ideal relativistic spinning gas: polarization and spectra
• Electrical Conductivity of Quark-Gluon Plasma in Strong Magnetic Fields
• Chiral asymmetry of the Fermi surface in dense relativistic matter in a magnetic field
• Strong-Field Physics in QED and QCD: From Fundamentals to Applications
• Magnetic-field Induced Screening Effect and Collective Excitations
• $\Lambda /\bar{\Lambda }$ Polarization and Splitting Induced by Rotation and Magnetic Field
• Polarization tensor of magnetized quark-gluon plasma at nonzero baryon density
• Extracting the magnitude of magnetic field at freeze-out in heavy-ion collisions
• Directed flow and global polarization in Au+Au collisions across energies covered by the beam energy scan at RHIC
• In-medium polarization tensor in strong magnetic fields (I): Magneto-birefringence at finite temperature and density
• Electric and magnetic conductivities in magnetized fermion systems
• In-medium polarization tensor in strong magnetic fields (II): Axial Ward identity at finite temperature and density