Holographic Photon Production and Anisotropic Flow

TL;DR

This paper uses holographic models to study thermal photon emission and anisotropic flow in quark-gluon plasma, improving spectral agreement but affecting flow predictions at different transverse momenta.

Contribution

It introduces holographic models tuned to lattice data to analyze photon production and flow in QGP, bridging holography with experimental observations.

Findings

Enhanced photon yield in holographic models.

Improved spectral agreement with experimental data.

Altered flow patterns at different transverse momenta.

Abstract

The thermal-photon emission from strongly coupled gauge theories at finite temperature via the bottom-up models in holographic QCD in the deconfined phase is studied. The models are constructed to approximately reproduce the electric conductivity obtained from lattice simulations for the quark gluon plasma (QGP). The emission rates are then embedded in hydrodynamic simulations combined with prompt photons and hadronic contributions to analyze the spectra and anisotropic flow of direct photons in RHIC and LHC. In general, the holographic models enhance the yield and improve the agreement in spectra, while they reduce the flow in low $p_T$ and increase it in high $p_T$.