D-instantons, String Field Theory and Two Dimensional String Theory

Abstract

In arXiv:1907.07688 Balthazar, Rodriguez and Yin (BRY) computed the one instanton contribution to the two point scattering amplitude in two dimensional string theory to first subleading order in the string coupling. Their analysis left undetermined two constants due to divergences in the integration over world-sheet variables, but they were fixed by numerically comparing the result with that of the dual matrix model. If we consider n-point scattering amplitudes to the same order, there are actually four undetermined constants in the world-sheet approach. We show that using string field theory we can get finite unambiguous values of all of these constants, and we explicitly compute three of these four constants. Two of the three constants determined this way agree with the numerical result of BRY within the accuracy of numerical analysis, but the third constant seems to differ by 1/2. We also discuss a shortcut to determining the fourth constant if we assume the equality of the quantum corrected D-instanton action and the action of the matrix model instanton. This also agrees with the numerical result of BRY. Note added: The apparent discrepancy in the third constant has been resolved in arXiv:2210.11473.

arXiv commentLaTeX file, 100 pages, This paper reports an apparent mismatch between string theory and matrix model results, hoping that someone will find an error; v2: The apparent mismatch has been resolved in arXiv:2210.11473

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Cited by in corpus (6)

• Normalization of D-instanton Amplitudes
• Normalization of Type IIB D-instanton Amplitudes
• The ZZ annulus one-point function in non-critical string theory: A string field theory analysis
• The complex Liouville string: worldsheet boundaries and non-perturbative effects
• String correlators on ${\text{AdS}}_3$: Four-point functions
• Large N Optimization for multi-matrix systems