Photon and Dilepton Production in Soft Wall AdS/QCD

TL;DR

This paper uses the Soft-Wall AdS/QCD model to compute photon production in strongly coupled quark-gluon plasma, revealing IR effects and spectral properties consistent with chiral perturbation theory.

Contribution

It demonstrates that the Soft-Wall AdS/QCD model accurately captures IR physics and spectral features of photon production in strongly coupled QCD-like theories.

Findings

Spectral function computed numerically matches AdS-dual theories with massive flavor.

IR cut-off affects low-frequency photon production rate.

Spectral function is smooth with no peaks, unlike massive flavor models.

Abstract

We consider the Soft-Wall-model of AdS/QCD to calculate photon production in strongly coupled Quark Gluon Plasma (sQGP). The IR cut-off only affects the low-frequency-component of the production rate. The full spectral function is determined numerically and shows remarkable similarity to computations of the photon production rate in AdS-duals of $\mathcal{N}=2$ theories with massive flavor. It is further support that Soft-Wall AdS-QCD correctly captures the IR physics of the chiral perturbation theory regime of QCD. We confirm this by relating the IR-effects of the massive flavor deformations to the AdS/QCD soft wall cut-off. The AdS/QCD spectral function is smooth, however, and unlike massive flavor models shows no spectral peaks.