
 PARTICLE PHYSICS, PARTICLE COSMOLOGY, AND FIELD THEORY 
  Field theory in its various forms (classical, quantum, finitetemperature, conformal, topological) is a powerful mathematical tool that can provide solutions to physical problems in areas as diverse as the interactions of elementary particles, the birth of the universe, and microelectronics. 
  A field, or classical field, is a mathematical entity which can be thought of as a collection of numbers that tells you something about each point in spacetime, such as the temperature at each point in a room. 
  In models of particle physics, phase transitions are necessary in order to explain how some elementary particles, such as the W boson, could receive its mass and yet not introduce devastating mathematical infinities (such as 1 divided by 0) in the quantum field theory. 
 www.damtp.cam.ac.uk /user/hep/public.html (1866 words) 
