2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/189830The use of elliptic flow and correlation measurements as constraints to establish the transport properties of hot and dense QCD matter is discussed. Measured Two- and three-particle correlation functions give initial hints for a "sonic boom". Elliptic flow measurements give the estimates $c_s \sim 0.35$ and $η/s \sim 0.1$ for the sound speed and viscosity to entropy ratio.Proceedings, International Conference on Strong and Electro Weak Matter, Brookhaven National Laboratory, May 10 - 13, 2006Nuclear Experimenttext