Electromagnetic Radiation from QCD Matter: Theory Overview

Abstract

Recent theory developments in electromagnetic radiation from relativistic heavy-ion collisions are reviewed. Electromagnetic observables can serve as a thermometer, a viscometer, and tomographic probes to the collision system. The current status of the "direct photon flow puzzle" is highlighted.

Comments: 8 pages, 4 figures; to appear in the proceedings for the Quark Matter 2015 conference, Kobe, Japan