Wake Potential in Strong Coupling Plasma from AdS/CFT Correspondence

TL;DR

This paper investigates the wake potential caused by a fast-moving charge in a strong coupling plasma using AdS/CFT correspondence, revealing significant differences from weak coupling behavior, especially at high velocities.

Contribution

It provides the first detailed comparison of wake potentials in strong versus weak coupling plasmas using holographic methods, highlighting the absence of certain collective modes in strong coupling.

Findings

Cerenkov-like radiation and Mach cone oscillations disappear at high velocity in strong coupling.

No plasmon mode with phase velocity below light exists in strong coupling plasma.

Distinct wake potential behaviors observed between strong and weak coupling regimes.

Abstract

With the dielectric function computed from AdS/CFT correspondence, we studied the wake potential induced by a fast moving charge in strong coupling plasma, and compared it with the weak coupling wake potential for different particle velocities as $v=0.55c$ and $v=0.99c$. The most prominent difference between strong and weak wake potential is that when $v=0.99c$ the remarkable oscillation due to Cerenkov-like radiation and Mach cone in weak coupling disappears in strong coupling, which implies that the plasmon mode with phase velocity lower than the speed of light dose not exist in strong coupling plasma.