The Feynman iεi ε in String Theory

preprint2013arXivOpen access

Abstract

The Feynman iεi\varepsilon is an important ingredient in defining perturbative scattering amplitudes in field theory. Here we describe its analog in string theory. Roughly one takes the string worldsheet to have Lorentz signature when a string is going on-shell although it has Euclidean signature generically.

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