Il Nuovo Cimento Series 10

, Volume 25, Issue 4, pp 901–911 | Cite as

Analyticity and unitarity — II

  • J. C. Polkinghorne
Article
First Online:
Received:

Summary

A previous discussion of the singularities of unitary theories is amplified. A derivation of Cutkosky’s formula for the discontinuity of first type Landau singularities is given without recourse to perturbation theory. The discontinuities associated with second type singularities are discussed. Their form is completely determined once the pure second type discontinuity is known.

Riassunto

Si amplia una precedente discussione delle singolarità delle teorie unitarie. Si dà una derivazione della formula di Cutkosky per la discontinuità delle singolarità di Landau del primo tipo, senza far ricorso alla teoria della perturbazione. Si discutono le discontinuità associate a singolarità del secondo tipo. La loro forma è completamente determinata quando si conosce la pura discontinuità di secondo tipo.

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Copyright information

© Società Italiana di Fisica 1962

Authors and Affiliations

  • J. C. Polkinghorne
    • 1
  1. 1.Institute for Advanced StudyPrinceton

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