2021/01/31 by Ashoke Sen
Physics and Astronomy · #Amplitude #Black Holes and Theoretical Physics #Bosonic string theory #Cosmology and Gravitation Theories #Heterotic string theory #Instanton #Massless particle #Mathematical physics #Non-critical string theory #Normalization (sociology) #Physics #Quantum Chromodynamics and Particle Interactions #Quantum electrodynamics #Quantum gravity #Quantum mechanics #Relationship between string theory and quantum field theory #String (physics) #String cosmology #String field theory #Theoretical physics #hep-th
paper · pdf · doi:10.1007/jhep11(2021)077
LaTeX file, 20 pages; v2: minor clarifications and references added
arxiv created 2021/01/31 · openalex publication_date 2021/11/01 · arxiv updated 2021/11/24 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
A bstract 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.