Geometric and quantum fluctuations in the initial state of heavy-ion collisions leave fingerprints in the measured multi-particle correlation functions. Thermal fluctuations during the quark-gluon plasma (QGP) evolution are another source of dynamical fluctuation. They are conceptually important and can play a crucial role in second-order viscous hydrodynamic simulations .
In this work, we present a full calculation of hadronic and photon observables including the thermal fluctuations. The evolution of thermal fluctuations is treated as a linearized perturbation on a hydrodynamic background . Effects on event-by-event charged hadron vn distribution, and on event-plane correlations will be addressed. Furthermore, because thermal photons are produced at all stages of evolution, they offer a window on earlier stages when temperatures are high and fluctuations are more significant. We elucidate the effects of fluctuations on electromagnetic phenomenology, with an emphasis on direct photon observables.
 P. Kovtun, G. D. Moore and P. Romatschke, Phys. Rev. D 84, 025006 (2011).
 C. Young et al. , Phys. Rev. C 91, 044901 (2015).
|Preferred Track||Electromagnetic Probes|