The Birth of string theory

  title={The Birth of string theory},
  author={Paolo Di Vecchia},
  journal={Lecture Notes in Physics},
  • P. Vecchia
  • Published 1 April 2007
  • Physics
  • Lecture Notes in Physics
In this contribution we go through the developments that in the years from 1968 to about 1974 led from the Veneziano model to the bosonic string theory. They include the construction of the N-point amplitude for scalar particles, its factorization through the introduction of an infinite number of oscillators and the proof that the physical subspace was a positive-definite Hilbert space. We also discuss the zero slope limit and the calculation of loop diagrams. Lastly, we describe how it finally… 

The early days of string theory and an N-pion extension of the Lovelace–Shapiro model

  • P. Di Vecchia
  • Physics
    Journal of Physics A: Mathematical and Theoretical
  • 2020
We discuss the attempts made at the end of the sixties and at the beginning of the seventies in order to get a consistent N-point amplitude involving the lightest hadrons, such as the pion, that then

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