2005/03/25 by Marco Nicolosi, M. Nicolosi, Nicolosi, Marco
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #FOS: Physical sciences #High Energy Physics - Theory (hep-th) #Particle physics theoretical and experimental studies #hep-th
paper · pdf · doi:10.48550/arxiv.hep-th/0503204
175 pages, 16 eps figures. v2,v3: reference added and defective pdf
openalex publication_date 2005/03/25 · arxiv created 2005/04/05 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
This Thesis discusses a number of issues related to the problem of tadpoles and vacuum redefinitions that the breaking of supersymmetry brings about in String Theory. The idea pursued here is to try to formulate the theory in a ``wrong'' vacuum (the vacuum that one naively identifies prior to the redefinitions) and, gaining some intuition from some simpler field theory settings, try to set up a calculational scheme for vacuum redefinitions in String Theory. This requires in general complicated resummations, but some simpler cases can be identified. This is true, in principle, for models with fluxes, where tadpoles can be perturbatively small, and for the one-loop threshold corrections, that in a large class of models (without rotated branes) remain finite even in the presence of tadpoles. The contents of the Thesis elaborate on those of hep-th/0410101, but include a number of additions, related to the explicit study of a quartic potential in Field Theory, where some subtleties were previously overlooked, and to the explicit evaluation of the one-loop threshold corrections for a number of string models with broken supersymmetry.