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Two-Point String Amplitudes
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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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Cited by 4 Pith papers
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Norm of the no-boundary state
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.
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Boundary terms in string field theory
The free closed string field theory action is supplemented with a boundary term, derived from the failure of BRST cyclicity, that reproduces the Gibbons-Hawking-York term at low energies.
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Two-point tree-level string amplitudes as AdS transition amplitudes
Two-point open and closed string amplitudes are algebraically recast, in 't Hooft-like tensionless limits, into sums of AdS scalar transition amplitudes with coupling constants governed by worldsheet curvatures.
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CFT Correlators from (0,2) Heterotic String
The (0,2) heterotic string amplitudes with positive winding are shown to match correlation functions of the symmetric product CFT (ML)^N/S_N, confirming a prior proposal.
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