This volume contains articles by experts on the plasma phase of quantum chromodynamics and the plasma phase of electroweak interactions. The former plasma phase is being tested at RHIC (Brookhaven) and has been tested at CERN. Both plasmas have played roles in the development of the Universe since the Big Bang. A third topic is that of the high-density colour superconductive state of matter, which may be present in the core of neutron stars. This book should be of interest to PhD students, researchers and academics in particle physics.