Charged Stringy Black Holes With Non-Abelian Hair

Static spherically symmetric asymptotically flat charged black hole solutions are constructed within the magnetic SU(3) sector of the 4-dimensional heterotic string effective action. They possess non-abelian hair in addition to the Coulomb magnetic field and are qualitatively similar to the Einstein-Yang-Mills colored SU(3) black holes except for the extremal case. In the extremality limit the horizon shrinks and the resulting geometry around the origin coincides with that of an extremal abelian dilatonic black hole with magnetic charge. Non-abelian hair exibits then typical sphaleron structure.Comment: 11 pages, LaTex, (7 figures upon request

SU(3) Einstein-Yang-Mills-Dilaton Sphalerons and Black Holes

SU(3) Einstein-Yang-Mills-dilaton theory possesses sequences of static spherically symmetric sphaleron and black hole solutions for the SU(2) and the SO(3) embedding. The solutions depend on the dilaton coupling constant $\gamma$, approaching the corresponding Einstein-Yang-Mills solutions for $\gamma \rightarrow 0$, and Yang-Mills-dilaton solutions in flat space for $\gamma \rightarrow \infty$. The sequences of solutions tend to Einstein-Maxwell-dilaton solutions with different magnetic charges. The solutions satisfy analogous relations between the dilaton field and the metric for general $\gamma$. Thermodynamic properties of the black hole solutions are discussed.Comment: LATEX, 21 pages, including 6 figure