THE EVALUATION OF STRING AMPLITUDES
D. B. Fairlie · 2007
The geometrical approach to the evaluation of amplitudes for the ground state of strings is reviewed, and related developments are con-sidered A case is made that most of the ideas in string theory were already discovered in embryo in the fruitful years 1969-1974. 1 The Beginnings In the middle of year 1968 I was feeling very pessimistic about the possibility of theorists ever being able to say anything about scattering amplitudes for hadrons, beyond the simple tree and Regge pole approximations and was contemplating chang-ing fields. However, to everyone’s complete surprise Gabriele Veneziano came up with his famous compact form for a dual 1 amplitude; The amplitude which describes the scattering of four identical scalar particles, A(s, t, u) where is given by the sum of three terms