The Feynman $i ε$ in String Theory

Published 19 Jul 2013 in hep-th | (1307.5124v1)

Abstract: The Feynman $i\varepsilon$ 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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Edward Witten

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