The off-shell Veneziano amplitude in Schnabl gauge
arXiv:0708.2591 · doi:10.1088/1126-6708/2008/01/018
Abstract
We give a careful definition of the open string propagator in Schnabl gauge and present its worldsheet interpretation. The propagator requires two Schwinger parameters and contains the BRST operator. It builds surfaces by gluing strips of variable width to the left and to the right of off-shell states with contracted or expanded local frames. We evaluate explicitly the four-point amplitude of off-shell tachyons. The computation involves a subtle boundary term, crucial to enforce the correct exchange symmetries. Interestingly, the familiar on-shell physics emerges even though string diagrams produce Riemann surfaces more than once. Off-shell, the amplitudes do not factorize over intermediate on-shell states.
48 pages, 10 figures. v2:acknowledgments added
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- Closed Superstring Field Theory and its Applications
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- Analytical Solutions of Open String Field Theory
- Solutions from boundary condition changing operators in open string field theory
- Mass Renormalization in String Theory: General States
- General marginal deformations in open superstring field theory
- Linear b-Gauges for Open String Fields
- Four Lectures on Analytic Solutions in Open String Field Theory
- Solutions from boundary condition changing operators in open superstring field theory
- Singular gauge transformations in string field theory
- Pure Gauge Configurations and Tachyon Solutions to String Field Theories Equations of Motion
- Dynamics and Stability of Light-Like Tachyon Condensation
- Validity of Gauge-Fixing Conditions and the Structure of Propagators in Open Superstring Field Theory
- Comments on superstring field theory and its vacuum solution
- String Mass Shifts
- General Linear Gauges and Amplitudes in Open String Field Theory
- Open string stub as an auxiliary string field
- More on stubs in open string field theory
- Worldsheet for Generalized Veneziano Amplitudes