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|Type:||Artigo de periódico|
|Title:||Ehlers-Harrison transformations and black holes in dilaton-axion gravity with multiple vector fields|
|Abstract:||Dilaton-axion gravity with p U(1) vector fields is studied on space-times admitting a timelike Killing vector field. A three-dimensional a model is derived in terms of Kahler geometry, and a holomorphic representation of the SO(2,2+p) global symmetry is constructed. A general static black hole solution depending on 2p+5 parameters is obtained via SO(2,2+p) covariantization of the Schwarzschild solution. The metric in the curvature coordinates looks like the variable mass Reissner-Nordstrom one and generically possesses two horizons. The inner horizon is pushed to the singularity if electric and magnetic SO(p) charge vectors are parallel. For nonparallel charges the inner horizon has a finite area except for an extremal limit when this property is preserved only for orthogonal charges. Extremal dyon configurations with orthogonal charges have finite horizon radii continuously varying from zero to the Arnowitt-Deser-Misner mass. The new general solution is endowed with a Newman-Unti-Tamburino parameter, asymptotic values of dilaton and axion, and a gauge parameter which can be used to ascribe any given value to one of the scalar charges.|
|Editor:||American Physical Soc|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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