Loops, Unitarity, and Analyticity

  • Michael Stone
Part of the Graduate Texts in Contemporary Physics book series (GTCP)


In this chapter we will explore how unitarity, the requirement that probability be conserved in quantum time evolution, interacts with the perturbation expansion.


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  1. 1.
    Quod est inferius est sicut quod est superius, et quod est superius est sicut quod est inferius, ad perpetranda miracula rei unius. (Hermes Trismegistus, The Emerald Tablet.)Google Scholar
  2. 2.
    Julian Seymour Schwinger. Born Feb. 12, 1918, New York, NY. Died July 16, 1994, Los Angeles, CA, Nobel Prize in Physics 1968.Google Scholar

Copyright information

© Springer Science+Business Media New York 2000

Authors and Affiliations

  • Michael Stone
    • 1
  1. 1.Loomis Laboratory Department of PhysicsUniversity of IllinoisUrbanaUSA

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