Unruh Effect and the Concept of Temperature
  Based on a discussion of the concepts of temperature, passivity and efficiency in the framework of quantum field theory, the physical interpretation of the Unruh effect is reviewed PACS: 03.70.+k, 04.70.Dy 
Detlev Buchholz and Christoph Solveen
gr-qc hep-th math-ph math.MP