Abstract
D-instanton amplitudes suffer from various infrared divergences associated with tachyonic or massless open string modes, leading to ambiguous contribution to string amplitudes. It has been shown previously that string field theory can resolve these ambiguities and lead to unambiguous expressions for D-instanton contributions to string amplitudes, except for an overall normalization constant that remains undetermined. In this paper we show that string field theory, together with the world-sheet description of the amplitudes, can also fix this normalization constant. We apply our analysis to the special case of two dimensional string theory, obtaining results in agreement with the matrix model results obtained by Balthazar, Rodriguez and Yin.
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Sen, A. Normalization of D-instanton amplitudes. J. High Energ. Phys. 2021, 77 (2021). https://doi.org/10.1007/JHEP11(2021)077
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DOI: https://doi.org/10.1007/JHEP11(2021)077