385 research outputs found
Black Saturn with dipole ring
We present a new stationary, asymptotically flat solution of 5D
Einstein-Maxwell gravity describing a Saturn-like black object: a rotating
black hole surrounded by a rotating dipole black ring. The solution is
generated by combining the vacuum black Saturn solution and the vacuum black
ring solution with appropriately chosen parameters. Some basic properties of
the solution are analyzed and the basic quantities are calculated.Comment: 15 pages, LaTex; v2 some typos corrected; v3 minor changes; v4
references adde
Uniqueness and nonuniqueness of the stationary black holes in 5D Einstein-Maxwell and Einstein-Maxwell-dilaton gravity
In the present paper we investigate the general problem of uniqueness of the
stationary black solutions in 5D Einstein-Maxwell-dilaton gravity with
arbitrary dilaton coupling parameter containing the Einstein-Maxwell gravity as
a particular case. We formulate and prove uniqueness theorems classifying the
stationary black hole solutions in terms of their interval structure, electric
and magnetic charges and the magnetic fluxes. The proofs are based on the
nonpositivity of the Riemann curvature operator on the space of the potentials
which imposes restrictions on the dilaton coupling parameter.Comment: 21 pages, LaTe
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