2001/04/11 by M. Z. Iofa, Mikhail Z. Iofa, Iofa, M. Z.
Engineering · Physics and Astronomy · #Black Holes and Theoretical Physics #FOS: Physical sciences #High Energy Physics - Theory (hep-th) #Particle physics theoretical and experimental studies #Superconducting Materials and Applications #hep-th
paper · pdf · doi:10.48550/arxiv.hep-th/0104103
LaTeX, 10 pages, Contribution to the Memorial Volume dedicated to Professor E.S.Fradkin
arxiv created 2001/04/11 · openalex publication_date 2001/04/11 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We discuss the form of the string-loop-corrected effective action and the loop-corrected solutions of the equations of motion. At the string-tree level, a solution we consider is the extremal magnetic black hole, in which case the tree-level effective gauge couplings decrease at small r, and in this region string-loop corrections to the gauge couplings become important. The effective 4D theory is the N=2 supergravity interacting with matter. Using the N=2 structure of the theory, we calculate the loop corrections to the effective action and solve the loop-corrected equations of motion. In the resulting perturbative solution for the metric, singularity at the origin is smeared by quantum effects.