Two-Point String Amplitudes

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arxiv 1906.06051 v1 pith:YQOZ4WL2 submitted 2019-06-14 hep-th

Harold Erbin , Juan Maldacena , Dimitri Skliros This is my paper

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keywords stringtwo-pointamplitudeamplitudesexpressionflatfreegiven

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We show that the two-point tree level amplitude in string theory in flat space is given by the standard free particle expression.

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Norm of the no-boundary state
hep-th 2025-06 conditional novelty 7.0 of 10

At one loop and late time, the norm of the Hartle-Hawking no-boundary state vanishes as e^{S0}/(vol(SO(d,1)) S0^{d(d+1)/4}), and adding an observer stabilizes it to a large positive value.