Browsing by Author "Moutsopoulos, George"

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An exact conformal symmetry Ansatz on Kaluza-Klein reduced TMG
(2011-11-01)
Moutsopoulos, George
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Ritter, Patricia
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電子物理學系
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Department of Electrophysics
Using a Kaluza-Klein dimensional reduction, and further imposing a conformal Killing symmetry on the reduced metric generated by the dilaton, we show an Ansatz that yields many of the known stationary axisymmetric solutions to TMG.
Homogeneous anisotropic solutions of topologically massive gravity with a cosmological constant and their homogeneous deformations
(2013-06-21)
Moutsopoulos, George
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電子物理學系
;
Department of Electrophysics
We solve the equations of topologically massive gravity (TMG) with a potentially non-vanishing cosmological constant for homogeneous metrics without isotropy. We only reproduce known solutions. We also discuss their homogeneous deformations, possibly with isotropy. We show that de Sitter space and hyperbolic space cannot be infinitesimally homogeneously deformed in TMG. We clarify some of their Segre-Petrov types and discuss the warped de Sitter spacetime.
No more CKY two-forms in the NHEK
(2012-02-21)
Mitsuka, Yoshihiro
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Moutsopoulos, George
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電子物理學系
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Department of Electrophysics
We show that in the near-horizon limit of a Kerr-NUT-AdS black hole, the space of conformal Killing-Yano two-forms does not enhance and remains of dimension 2. The same holds for an analogous polar limit in the case of extremal NUT charge. We also derive the conformal Killing-Yano p-form equation for any background in an arbitrary dimension in the form of parallel transport.