Electromagnetic radiation from the pre-hydrodynamics stage of the quark-gluon plasma

Photons produced in the pre-hydrodynamics stage of the quark-gluon plasma created in relativistic heavy-ion collisions were computed using momentum distribution functions of partons obtained from solutions of the Boltzmann equation. The effect of the initial gluon momentum anisotropy ξ and the dependence on the saturation momentum Q_s was investigated; we report on results obtained by varying the latter in this work. We see that small Q_s results in a photon yield enhancement, whereas a larger Q_s results in a pre-equilibrium photon suppression, owing to the strict constraint of matching to experimental energy density used in this work.