Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1998-04-29
Physics
High Energy Physics
High Energy Physics - Theory
A 4 page version (including summary and contents), PhD thesis, full postscript version (197 pages in Greek) available at htt
Scientific paper
In the framework of the four-dimensional effective theory of heterotic superstrings at low energies, which is considered as a generalised theory of gravity, we search for new black hole solutions. The analytical expressions of all the scalar fields of the effective theory is determined in a Kerr-Newman black hole background and the evasion of the existing "no-hair" theorems in the presence of higher curvature gravitational terms is demonstrated. New black hole solutions, such as the Dilatonic and the Coloured black holes, are determined by use of numerical integration and their properties are analysed. Finally, the linear stability of Dilatonic black holes under small time-dependent perturbations is exhibited through a semi-analytic method.
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