High temperature behavior of non-local observables in boosted strongly coupled plasma: A holographic study

TL;DR

This paper uses holography to analyze how boosting a strongly coupled plasma affects non-local observables like entanglement entropy and two-point correlators, revealing significant modifications and orientation-dependent effects at high temperature.

Contribution

It provides a detailed holographic study of boosted plasma's non-local observables, highlighting the impact of boost velocity and orientation on entanglement entropy and correlations.

Findings

Boost significantly alters entanglement entropy and correlators.

Orientation of the entangling region relative to boost direction is crucial.

Breaking rotational symmetry affects non-local observable behavior.

Abstract

In this work, we perform a holographic analysis to study non local observables associated to a uniformly \textit{boosted} strongly coupled large $N$ thermal plasma in $d$-dimensions. In order to accomplish the holographic analysis, the appropriate dual bulk theory turns out to be $d+1$ dimensional \textit{boosted} AdS-Schwarzschild blackhole background. In particular, we compute entanglement entropy of the boosted plasma at high temperature living inside a strip geometry with entangling width $l$ in the boundary at a particular instant of time. We also study the two-point correlators in the boundary by following geodesic approximation method. For analyzing the effect of boosting on the thermal plasma and correspondingly on both non local observables, we keep the alignment of the width of region of interest both parallel and perpendicular to the direction of the boost. We find our results significantly modified compared to those in un-boosted plasma up to the quadratic order of the boost velocity $v$. More interestingly, the relative orientation of the boost and the entangling width plays a crucial role to quantify the holographic entanglement entropy in the boundary theory. The breaking of rotational symmetry in the boundary theory due to the boosting of the plasma along a specific flat direction causes this interesting feature.