Observables in Strongly Coupled Anisotropic Theories

TL;DR

This paper reviews anisotropic gauge/gravity dualities, presents new results on various observables in strongly coupled anisotropic theories, and discusses their implications for quark-gluon plasma modeling.

Contribution

It introduces new calculations of observables in anisotropic holographic models and compares them with weakly coupled results, highlighting challenges in matching experimental data.

Findings

Anisotropic models show modified static potentials and forces.

Jet quenching and energy loss are significantly affected by anisotropy.

Parameter bounds reveal difficulties in reproducing quark-gluon plasma properties.

Abstract

We review certain anisotropic gauge/gravity dualities, focusing more on a theory with space dependent axion term. Then we discuss and also present some new results for several observables: the static potential and force, the imaginary part of the static potential, the quark dipole in the plasma wind, the drag force and diffusion time, the jet quenching of heavy and light quarks, the energy loss of rotating quarks, the photon production and finally the violation of the holographic viscosity over entropy bound. The corresponding weakly coupled results are also discussed. Finally we investigate the bounds of the parameters of the current strongly coupled anisotropic theories attempting to match them with the observed quark-gluon plasma and report the problems appear.