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.
Two-point closed string amplitudes in the BRST formalism
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abstract
Two-point tree-level amplitudes in bosonic closed string theory are described by a correlation function within the BRST formalism, which respects manifest Lorentz and conformal invariance. In the derivation of the two-point amplitudes, we use the mostly BRST exact operator, which has been introduced for two-point open string amplitudes, and a closed string vertex with ghost number three, which has been explored in our recent work, in addition to the conventional one.
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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.