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18 papers · 1 filter
Charged Rotating Black Hole in Three Spacetime Dimensions
Cristian Martinez, Claudio Teitelboim, Jorge Zanelli
The generalization of the black hole in three-dimensional spacetime to include an electric charge Q in addition to the mass M and the angular momentum J is given. The field equatio…
Analytic calculation of the 1-loop effective action for the O(N+1)-symmetric 2-dimensional nonlinear sigma-model
M. Bartels, G. Mack, G. Palma
Polyakov's calculation of the effective action for the 2d nonlinear sigma-Model is generalized by purely analytic means to include contributions which are not UV-divergent and whic…
Conserved Charges for Even Dimensional Asymptotically AdS Gravity Theories
Rodrigo Aros, Mauricio Contreras, Rodrigo Olea +2
Mass and other conserved Noether charges are discussed for solutions of gravity theories with locally Anti-de Sitter asymptotics in 2n dimensions. The action is supplemented with a…
1-Loop improved lattice action for the nonlinear sigma-model
M. Bartels, G. Mack, G. Palma
In this paper we show the Wilson effective action for the 2-dimensional O(N+1)-symmetric lattice nonlinear sigma-model computed in the 1-loop approximation for the nonlinear choice…
Conserved charges for gravity with locally AdS asymptotics
Rodrigo Aros, Mauricio Contreras, Rodrigo Olea +2
A new formula for the conserved charges in 3+1 gravity for spacetimes with local AdS asymptotic geometry is proposed. It is shown that requiring the action to have an extremum for…
Collective motion and solid-liquid-type transitions in vibrated granular layers
Nicolas Mujica, Francisco Melo
From pressure and surface dilation measurements, we show that a solid-liquid-type transition occurs at low excitation frequencies in vertically vibrated granular layers. This trans…