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Gauging the scale invariance of Einstein equations: Weyl invariant equations for gravity
Máximo Bañados
We derive a Weyl invariant equation for Gravity by gauging the global Weyl invariance of vacuum Einstein equations. The equation is linear in the curvature and a natural generaliza…
Chiral Gravitational Waves in Palatini Chern-Simons
Felipe Sulantay, Macarena Lagos, Máximo Bañados
We study the parity-breaking higher-curvature gravity theory of Chern-Simons (CS), using the Palatini formulation in which the metric and connection are taken to be independent fie…
A note on the uniqueness of the dRGT massive gravity theory
Máximo Bañados
We revisit the problem of gravity coupled to a background metric , looking for ghost free interactions. It is known that elimination of the Boulware-Desewr ghost is equival…
Can Schwarzschild Black Holes Be Accelerators of Spinning Massive Particles?
Cristóbal Armaza, Máximo Bañados, Benjamin Koch
It is known that the center-of-mass energy of the collision of two massive particles following geodesics around a black hole presents a maximum. The maximum energy increases when t…
Noether Identities and Gauge-Fixing the Action for Cosmological Perturbations
Macarena Lagos, Máximo Bañados, Pedro G. Ferreira +1
We propose and develop a general algorithm for finding the action for cosmological perturbations which rivals the conventional, gauge-invariant approach and can be applied to theor…
The rise of a tensor instability in Eddington-inspired gravity
Celia Escamilla-Rivera, Maximo Banados, Pedro G. Ferreira
In this work an extension to Eddington's gravitational action is analyzed. We consider the tensor perturbations of a FLRW space-time in the Eddington regime in where the tensor mod…
A tensor instability in the Eddington inspired Born-Infeld Theory of Gravity
Celia Escamilla-Rivera, Maximo Banados, Pedro G. Ferreira
In this paper we consider an extension to Eddington's proposal for the gravitational action. We study tensor perturbations of a homogeneous and isotropic space-time in the Eddingto…
A note on the Cardy formula and black holes in 3d (massive) bigravity
Máximo Bañados, Miguel Pino
We report full agreement between the Bekenstein-Hawking semiclassical entropy and Cardy's formula for black holes in 3d (massive) bigravity. Since this theory does have local bulk…
The bigravity black hole and its thermodynamics
Máximo Bañados, Andrés Gomberoff, Miguel Pino
We argue that the Isham-Storey exact solution to bigravity does not describe black holes because the horizon is a singular surface. However, this is not a generic property of bigra…
The Parameterised Post-Newtonian Limit of Bimetric Theories of Gravity
Timothy Clifton, Máximo Bañados, Constantinos Skordis
We consider the post-Newtonian limit of a general class of bimetric theories of gravity, in which both metrics are dynamical. The established parameterised post-Newtonian approach…
A note on bigravity and dark matter
Máximo Bañados, Andrés Gomberoff, Davi C. Rodrigues +1
We show that a class of bi-gravity theories contain solutions describing dark matter. A particular member of this class is also shown to be equivalent to the Eddington-Born-Infeld…
Eddington-Born-Infeld action and the dark side of general relativity
Maximo Banados
We review a recent proposal to describe dark matter and dark energy based on an Eddington-Born-Infeld action. The theory is successful in describing the evolution of the expansion…
Higher Dimensional Chern-Simons Theories and Topological Black Holes
Maximo Banados
It has been recently pointed out that black holes of constant curvature with a "chronological singularity" can be constructed in any spacetime dimension. These black holes share ma…
Black Holes of Constant Curvature
Maximo Banados
Black holes of constant curvature are constructed by identifying points in anti-de Sitter space. In n dimensions the resulting topology is R^{n-1} * S_1, as opposed to the usual R^…
Darboux coordinates for (first order) tetrad gravity
Maximo Banados, Mauricio Contreras
The Hamiltonian form of the Hilbert action in the first order tetrad formalism is examined. We perform a non-linear field redefinition of the canonical variables isolating the part…
A note on the gauge symmetries of pure Chern-Simons theories with p-form gauge fields
M. Banados, M. Henneaux, C. Iannuzzo +1
The gauge symmetries of pure Chern-Simons theories with p-form gauge fields are analyzed. It is shown that the number of independent gauge symmetries depends crucially on the parit…
Constant Curvature Black Holes
Maximo Banados
Constant curvature black holes are constructed by identifying points in anti-de Sitter space. In n dimensions, the resulting topology is R^{n-1} * S_1, as opposed to the usual R^2…
Black Hole Entropy in the Chern-Simons Formulation of 2+1 Gravity
Maximo Banados, Andres Gomberoff
We examine Carlip's derivation of the 2+1 Minkowskian black hole entropy. A simplified derivation of the boundary action -valid for any value of the level k- is given.
Dilaton gravity (with a Gauss-Bonnet term) derived from five-dimensional Chern-Simons gravity
Maximo Banados
We study the problem of boundary terms and boundary conditions for Chern-Simons gravity in five dimensions. We show that under reasonable boundary conditions one finds an effective…
Higher dimensional Chern-Simons supergravity
Maximo Banados, Ricardo Troncoso, Jorge Zanelli
A Chern-Simons action for supergravity in odd-dimensional spacetimes is proposed. For all odd dimensions, the local symmetry group is a non trivial supersymmetric extension of the…
Black Hole Entropy and the Dimensional Continuation of the Gauss-Bonnet Theorem
Máximo Bañados, Claudio Teitelboim, Jorge Zanelli
The Euclidean black hole has topology . It is shown that -in Einstein's theory- the deficit angle of a cusp at any point in and the area of the…
Black Holes in Einstein-Lovelock Gravity
Maximo Banados
Static, spherically symmetric solutions of the field equations for a particular dimensional continuation of general relativity with negative cosmological constant are found. In eve…
Dimensionally Continued Black Holes
Maximo Banados, Claudio Teitelboim, Jorge Zanelli
Static, spherically symmetric solutions of the field equations for a particular dimensional continuation of general relativity with negative cosmological constant are studied. The…
Geometry of the 2+1 Black Hole
Maximo Banados, Marc Henneaux, Claudio Teitelboim +1
The geometry of the spinning black holes of standard Einstein theory in 2+1 dimensions, with a negative cosmological constant and without couplings to matter, is analyzed in detail…