The high-energy heavy-ion collider at Brookhaven National Laboratory has been studying interactions of ultra-relativistic nuclei starting in 2000. Over the last eight years, the hottest nuclear matter on earth has been studied extensively and now we can describe some of the material properties of this matter, often termed the Quark Gluon Plasma. Amongst these properties are near perfect fluidity and extreme opacity. We will describe the experimental techniques, how the properties are constrained, and connections to other areas of physics.

ANL Physics Division Colloquium Schedule