of the Institute of Theoretical Physics

- August 2, 2010
- Monday (!) 13:10, ITF
- Gauss-Bonnet black holes with symmetry
*Hideki Maeda*- Centro de Estudios Cientificos, Chile
- October 12, 2010
- Characteristic sound of black-hole disk accretion
*dr. Jiří Horák*- PRA Group, Astronomical Institute of AS CR
- (seminar in Czech language)
- October 19, 2010
- Ultraspinning instability of black holes
*dr. Oscar Dias*- Relativity & Gravitation Group, DAMTP, University of Cambridge
We present the first example of a linearized gravitational instability of an asymptotically flat vacuum black hole: the ultraspinning instability first conjectured to exist by Emparan and Myers. We study perturbations of a Myers-Perry black hole 1) with a single spin and 2) with equal angular momenta. In the singly spinning case we find the stationary perturbations that mark the onset of the instability and the appearance of the new pinched black hole phases that are conjectured to connect to the black ring and black Saturn families. We further analyse the asymptotically AdS case, and determine the onset of the instability as a function of the cosmological constant. For the equal spin case, we find perturbations that grow exponentially in time and the dispersion relation of the instability. The onset of the instability is associated with the appearance of time-independent perturbations which generically break all but one of the rotational symmetries. This is interpreted as evidence for the existence of a new 20-parameter family of black hole solutions with only a single rotational symmetry, ie that saturate Hawking's rigidity theorem. We also present results for the Gregory-Laflamme instability of rotating black strings, demonstrating for the first time that rotation makes black strings more unstable. Finally, we establish a formal connection between this classical instability and thermodynamics that provides a "thermodynamic candle" to anticipate the possible existence of this instability in other black holes.

- October 26, 2010
- Kerr / CFT correspondence
*Matěj Kudrna*- ÚTF / FzÚ AV ČR
- (seminar in Czech language)
- November 2, 2010
- Particle motion in the vicinity of compact objects / Triple gravitational microlens
*Jan Čechura / Kamil Daněk*- AsÚ AV ČR / ÚTF
- (seminar in Czech language)
- November 9, 2010
- Action at distance - GTR for a working day
*Tomáš Ledvinka*- ÚTF
- (seminar in Czech language)
- November 16, 2010
- Zážitky z pádu do černé díry / Cylindrické zdroje gravitačních vln
*Anton Khirnov / Aleš Turnovec*- ÚTF
- (seminar in Czech language)
- November 23, 2010
- Twin paradox in general relativity / On convergence of perturbation series in stationary axisymmetric case
*Jiří Daněk / Pavel Čížek*- ÚTF
- (seminar in Czech language)
- November 30, 2010
- seminář se nekoná
- (seminar in Czech language)
- December 7, 2010
- Charged particles in EM field on Kerr background, chaos and symplectic integrators
*Ondřej Kopáček*- skupina relativistické astrofyziky, AsÚ AV ČR
- (seminar in Czech language)
- December 14, 2010
- Charged particles in EM field on Kerr background, chaos and symplectic integrators - II
*Ondřej Kopáček*- skupina relativistické astrofyziky, AsÚ AV ČR
- (seminar in Czech language)
- January 11, 2011
- Post-Newtonian Hamiltonians and spin effects in general relativity
*dr. Jan Steinhoff*- Institute of Theoretical Physics, F. Schiller University in Jena

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