Holographic photon production in heavy ion collisions

Ioannis Iatrakis, Elias Kiritsis, Chun Shen, Di Lun Yang

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


The thermal-photon emission from strongly coupled gauge theories at finite temperature is calculated using holographic models for QCD in the Veneziano limit (V-QCD). The emission rates are then embedded in hydrodynamic simulations combined with prompt photons from hard scattering and the thermal photons from hadron gas to analyze the spectra and anisotropic flow of direct photons at RHIC and LHC. The results from different sources responsible for the thermal photons in QGP including the weakly coupled QGP (wQGP) from perturbative calculations, strongly coupled N = 4 super Yang-Mills (SYM) plasma (as a benchmark for reference), and Gubser’s phenomenological holographic model are then compared. It is found that the direct-photon spectra are enhanced in the strongly coupled scenario compared with the ones in the wQGP, especially at high momenta. Moreover, both the elliptic flow and triangular flow of direct photons are amplified at high momenta for V-QCD and the SYM plasma. The results are further compared with experimental observations.

Original languageEnglish
Article number35
JournalJournal of High Energy Physics
Issue number4
Publication statusPublished - 2017 Apr 1
Externally publishedYes


  • AdS-CFT Correspondence
  • Holography and quark-gluon plasmas

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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