2020/02/29 by Ashoke Sen · 1 citation
Physics and Astronomy · #Analytic continuation #Black Holes and Theoretical Physics #Continuation #Cosmology and Gravitation Theories #Formalism (music) #Gauge theory #Moduli space #Open string #Perturbation theory (quantum mechanics) #Quantum Chromodynamics and Particle Interactions #String field theory #String theory #gr-qc #hep-th
paper · pdf · doi:10.1007/jhep08(2020)075
LaTeX file, 24 pages; v2: expanded discussion on ghost zero modes
openalex created_date 2020/02/24 · arxiv created 2020/05/13 · openalex publication_date 2020/08/01 · arxiv updated 2020/12/02 · openalex updated_date 2026/08/05
A bstract D-instanton world-volume theory has open string zero modes describing collective coordinates of the instanton. The usual perturbative amplitudes in the D-instanton background suffer from infra-red divergences due to the presence of these zero modes, and the usual approach of analytic continuation in momenta does not work since all open string states on a D-instanton carry strictly zero momentum. String field theory is well-suited for tackling these issues. However we find a new subtlety due to the existence of additional zero modes in the ghost sector. This causes a breakdown of the Siegel gauge, but a different gauge fixing consistent with the BV formalism renders the perturbation theory finite and unambiguous. At each order, this produces extra contribution to the amplitude besides what is obtained from integration over the moduli space of Riemann surfaces.