Baryon Number Non-Conservation and the Topology of Gauge Fields
  An introduction to the subject of baryon number non-conservation in the electroweak theory at high temperatures or energies is followed by a summary of our discovery of an infinite surface of sphaleron-like configurations which play a key role in baryon-number non-conserving transitions in a hot electroweak plasma. 
Minos Axenides (Crete), Andrei Johansen (Harvard), Holger B. Nielsen   (Bohr Inst.), Ola Tornkvist (Fermilab)