<> "The repository administrator has not yet configured an RDF license."^^ . <> . . "Fundamental and Applied Problems of the String Theory Landscape"^^ . "In this thesis we study quantum corrections to string-derived effective actions \\textit{per se} as well as their implications for phenomenologically relevant setups like the \\textit{Large Volume Scenario} (LVS) and the \\textit{anti-D3-brane} uplift. \r\n\r\nIn the first part of this thesis, we improve the understanding of string loop corrections on general Calabi-Yau orientifolds from an effective field theory perspective by proposing a new classification scheme for quantum corrections. Thereby, we discover new features of string loop corrections, like for instance possible logarithmic effects in the Kahler and scalar potential, which are relevant for phenomenological applications like models of inflation. \r\n\r\n\r\nIn the next part of the thesis, we derive a simple and explicit formula, the \\textit{LVS parametric tadpole constraint} (PTC), \r\nthat ensures that the anti-D3-brane uplifted LVS dS vacuum is protected against the most dangerous higher order corrections. \r\nThe main difficulty appears to be the small uplifting contribution which is necessary due to the exponentially large volume obtained via the LVS. This in turn requires a large negative contribution to the tadpole which is quantified in the PTC. As the negative contribution to the tadpole is limited in weakly coupled string theories, the PTC represents a concrete challenge for the LVS. \r\n\r\nThe last part of the thesis investigates the impact of $\\alpha'$ corrections to the brane-flux annihilation process discovered by Kachru, Pearson, and Verlinde (KPV) on which the anti-D3-brane uplift is based. We find that $\\alpha'$ corrections drastically alter the KPV analysis with the result that much more flux in the Klebanov-Strassler throat is required than previously assumed in order to control the leading $\\alpha'$ corrections on the NS5-brane. The implication for the LVS with standard anti-D3-brane uplift can again be quantified by the PTC. Incorporating this new bound significantly increases the required negative contribution to the tadpole. In addition, we uncover a new uplifting mechanism not relying on large fluxes and hence deep warped throats, thereby sidestepping the main difficulties related to the PTC."^^ . "2023" . . . . . . . "Simon Julian"^^ . "Schreyer"^^ . "Simon Julian Schreyer"^^ . . . . . . "Fundamental and Applied Problems of the String Theory Landscape (PDF)"^^ . . . "thesis_schreyer.pdf"^^ . . . "Fundamental and Applied Problems of the String Theory Landscape (Other)"^^ . . . . . . "indexcodes.txt"^^ . . . "Fundamental and Applied Problems of the String Theory Landscape (Other)"^^ . . . . . . "lightbox.jpg"^^ . . . "Fundamental and Applied Problems of the String Theory Landscape (Other)"^^ . . . . . . "preview.jpg"^^ . . . "Fundamental and Applied Problems of the String Theory Landscape (Other)"^^ . . . . . . "medium.jpg"^^ . . . "Fundamental and Applied Problems of the String Theory Landscape (Other)"^^ . . . . . . "small.jpg"^^ . . "HTML Summary of #33629 \n\nFundamental and Applied Problems of the String Theory Landscape\n\n" . "text/html" . . . "530 Physik"@de . "530 Physics"@en . .