| 1. |
- Grumiller, Daniel, 1973-, et al.
(författare)
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Canonical analysis of cosmological topologically massive gravity at the chiral point
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- Wolfgang Kummer was a pioneer of two-dimensional gravity and a strong advocate of the first order formulation in terms of Cartan variables. In the present work we apply Wolfgang Kummer's philosophy, the `Vienna School approach', to a specific three-dimensional model of gravity, cosmological topologically massive gravity at the chiral point. Exploiting a new Chern-Simons representation we perform a canonical analysis. The dimension of the physical phase space is two per point, and thus the theory exhibits a local physical degree of freedom, the topologically massive graviton.
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| 2. |
- Grumiller, Daniel, 1973-, et al.
(författare)
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Consistent boundary conditions for cosmological topologically massive gravity at the chiral point
- 2008
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Ingår i: International Journal of Modern Physics D. - 0218-2718. ; 17:13-14, s. 2367-2372
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Tidskriftsartikel (refereegranskat)abstract
- We show that cosmological topologically massive gravity at the chiral point allows not only Brown-Henneaux boundary conditions as consistent boundary conditions, but slightly more general ones which encompass the logarithmic primary found in 0805.2610 as well as all its descendants.
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| 3. |
- Grumiller, Daniel, 1973-, et al.
(författare)
-
Instability in cosmological topologically massive gravity at the chiral point
- 2008
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Ingår i: Journal of High Energy Physics (JHEP). - : Springer Science and Business Media LLC. - 1126-6708 .- 1029-8479. ; :7, s. 134-
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Tidskriftsartikel (refereegranskat)abstract
- We consider cosmological topologically massive gravity at the chiral point with positive sign of the Einstein-Hilbert term. We demonstrate the presence of a negative energy bulk mode that grows linearly in time. Unless there are physical reasons to discard this mode, this theory is unstable. To address this issue we prove that the mode is not pure gauge and that its negative energy is time-independent and finite. The isometry generators L0 and 0 have non-unitary matrix representations like in logarithmic CFT. While the new mode obeys boundary conditions that are slightly weaker than the ones by Brown and Henneaux, its fall-off behavior is compatible with spacetime being asymptotically AdS3. We employ holographic renormalization to show that the variational principle is well-defined. The corresponding Brown-York stress tensor coincides with that of global AdS3. Finally we address possibilities to eliminate the instability and prospects for chiral gravity.
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