Journal
JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 11, Pages -Publisher
SPRINGER
DOI: 10.1007/JHEP11(2021)061
Keywords
D-branes; String Field Theory
Categories
Funding
- J. C. Bose fellowship of the Department of Science and Technology, India
- Infosys chair professorship
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In their study, Balthazar, Rodriguez, and Yin computed the one instanton contribution to the two-point scattering amplitude in two-dimensional string theory and resolved four undetermined constants in the world-sheet approach using string field theory. Three of these constants were determined to be consistent with numerical results, while the fourth constant showed a slight discrepancy.
In [4] 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.
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