Hawking radiation from acoustic black holes in relativistic heavy ion collisions

We propose a new analogue model of gravity - the evolving quark gluon plasma (QGP) produced in relativistic heavy ion collisions. This is “most inviscid” fluid known. Such low kinematic viscosity believed to reflect strongly correlated nature for QGP these experiments. Hence, it may provide good example quantum naturally suited studies acoustic Hawking radiation. Due rapid longitudinal expansion, presence sonic horizon also guaranteed here, though, general, this not static. Using Ultra molecular dynamics (UrQMD) simulations, we show that, under certain conditions, velocity plasma, near horizon, can become time independent short span during evolution system. During period, have conformally static metric with (conformal) Killing coinciding apparent horizon. An asymptotic observer will then see thermal flux phonons, constituting radiation, coming from For relatively energy collision considered where resulting QCD system governed by non-relativistic hydrodynamics, estimate temperature be about 4-5 MeV (with being 135 MeV). discuss experimental signatures radiation terms component rapidity dependence transverse momentum distribution detected particles. extension ultra-relativistic case which should lead higher temperature, along effects dynamical leading blue/red shift temperature.