String theory, at first glance, seems divorced from the standard techniques developed over the past 50 years for second quantized field theories. This is because string theory was first historically discovered as afirst quantized theory.This is the reason why string theory at times appears to be a random collection of arbitrary conventions. Although a second quantized field theory can be derived completely from a single action, a first quantized theory requires additional assumptions. In particular, the vertices, the choice of interactions, and the weights of these perturbation diagrams must be postulated by hand and checked to be unitary later.
KeywordsClosed String Point Particle Vertex Function Twist Operator World Sheet
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