The Feynman iε in string theory
The Feynman iε in string theory
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DOI:
10.1007/jhep04(2015)055
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发表时间:
2013-07
影响因子:
5.4
通讯作者:
E. Witten
中科院分区:
文献类型:
--
作者:
E. Witten
The Feynman iε 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.(This article is based on a talk presented at the Zuminofest in Berkeley, California, May 2-4, 2013.)