Probes of the quark-gluon plasma and plasma instabilities

Penetrating probes in heavy-ion collisions, like jets and photons, are sensitive to the transport coefficients of produced quark-gluon plasma, such as shear bulk viscosity. Quantifying this sensitivity requires a detailed understanding photon emission jet-medium interaction nonequilibrium plasma during hydrodynamic stages collisions. Up now, an has been hindered by instabilities. These instabilities arise out equilibrium lead spurious divergences when evaluating rate hard with plasma. In paper, we show that taking into account time evolution unstable cures these divergences. Specifically, calculate gluon two-point correlators setup small initial momentum anisotropy occupation density at first grows exponentially. Based on calculation, argue for phenomenological prescription where instability poles subtracted. Finally, Abelian case fields do not affect medium-induced our order approximation.