Resonant screening in dense and magnetized QCD matter

TL;DR

This paper investigates how magnetic fields and density affect the Debye screening mass in QCD matter, revealing divergences at specific conditions and oscillatory behavior influenced by magnetic field strength.

Contribution

It provides a detailed calculation of the Debye screening mass in dense, magnetized QCD matter using resummed perturbation theory, highlighting divergence conditions and oscillations.

Findings

Screening mass diverges when quark chemical potential matches Landau level energy.

In thermal medium, divergence disappears and oscillations occur.

Magnetic field influences screening mass with clear peaks at specific values.

Abstract

We calculate the Debye screening mass in thermal, dense and magnetized QCD matter in the frame of resummed perturbation theory. In the limit of zero temperature, when the Landau energy level and Fermi surface of quarks match each other $\mu_q^2=2n|qB|$, where $q$, $\mu_q$ and $B$ are respectively the quark electric charge, chemical potential and external magnetic field, the screening mass diverges and the system is in the state of weakly interacting parton gas, which is very different from the known result of strongly interacting quark-gluon plasma at high temperature. The divergence disappears in thermal medium, but the screening mass oscillates with clear peaks at the matched magnetic field.