Geometric actions for three-dimensional gravity

Three-Dimensional Gravity Reconsidered

We consider the problem of identifying the CFT’s that may be dual to pure gravity in three dimensions with negative cosmological constant. The c-theorem indicates that threedimensional pure gravity is consistent only at certain values of the coupling constant, and the relation to Chern-Simons gauge theory hints that these may be the values at which the dual CFT can be holomorphically factorized...

Four-Dimensional Entropy from Three-Dimensional Gravity.

At the horizon of a black hole, the action of (3+1)-dimensional loop quantum gravity acquires a boundary term that is formally identical to an action for three-dimensional gravity. I show how to use this correspondence to obtain the entropy of the (3+1)-dimensional black hole from well-understood conformal field theory computations of the entropy in (2+1)-dimensional de Sitter space.

Dimensional Reduction of Three Dimensional Gravity

Three dimensional Euclidean gravity in the dreibein-spin connection formalism is investigated. We use the monopole-instanton ansatz for the dreibein and the spin connection. We show that there is a solution for the equations of motion which has a degenerate metric in three dimensions. This solution corresponds to gravity on S. PACS: 04.20.-q , 04.60.-m

A method for 2-dimensional inversion of gravity data

Applying 2D algorithms for inverting the potential field data is more useful and efficient than their 3D counterparts, whenever the geologic situation permits. This is because the computation time is less and modeling the subsurface is easier. In this paper we present a 2D inversion algorithm for interpreting gravity data by employing a set of constraints including minimum distance, smoothness,...

Black holes in three-dimensional topological gravity.