557 citations · 2.3k across the 25 of their papers we have counts for
10 papers · 1 filter
Modified Gravity and Cosmology: An Update by the CANTATA Network
Emmanuel N. Saridakis, Ruth Lazkoz, Vincenzo Salzano +50
General Relativity and the CDM framework are currently the standard lore and constitute the concordance paradigm. Nevertheless, long-standing open theoretical issues, as well as…
Born-Infeld Gravity: Constraints from Light-by-Light Scattering and an Effective Field Theory Perspective
Jose Beltrán Jiménez, Adrià Delhom, Gonzalo J. Olmo +1
By using a novel technique that establishes a correspondence between general relativity and metric-affine theories based on the Ricci tensor, we are able to set stringent constrain…
Anisotropic deformations in a class of projectively-invariant metric-affine theories of gravity
Jose Beltrán Jiménez, Daniel de Andrés, Adrià Delhom
Among the general class of metric-affine theories of gravity, there is a special class conformed by those endowed with a projective symmetry. Perhaps the simplest manner to realise…
Minkowski space in gravity
Jose Beltran Jimenez, Alexey Golovnev, Tomi Koivisto +1
The full set of solutions of gravity with the Minkowski metric is considered in this note. At the 4-th order in perturbations around the trivial tetrad solution, a new mode…
Revisiting the Stability of Quadratic Poincaré Gauge Gravity
Jose Beltrán Jiménez, Francisco José Maldonado Torralba
Poincaré gauge theories provide an approach to gravity based on the gauging of the Poincaré group, whose homogeneous part generates curvature while the translational sector gives r…
Non-Linear Obstructions for Consistent New General Relativity
Jose Beltrán Jiménez, Konstantinos F. Dialektopoulos
We revisit the field content and consistency of the New General Relativity family of theories. These theories are constructed in a geometrical framework with a flat and metric-comp…
Cosmology in geometry
Jose Beltrán Jiménez, Lavinia Heisenberg, Tomi Sebastian Koivisto +1
The universal character of the gravitational interaction provided by the equivalence principle motivates a geometrical description of gravity. The standard formulation of General R…
Limits on the anomalous speed of gravitational waves from binary pulsars
Hermano Velten, Jose Beltrán Jiménez, Federico Piazza
A large class of modified theories of gravity used as models for dark energy predict a propagation speed for gravitational waves which can differ from the speed of light. This diff…
Spacetimes with vector distortion: Inflation from generalised Weyl geometry
Jose Beltrán Jiménez, Tomi S. Koivisto
Spacetime with general linear vector distortion is introduced. Thus, the torsion and the nonmetricity of the affine connection are assumed to be proportional to a vector field (and…
Tensor perturbations in a general class of Palatini theories
Jose Beltrán Jiménez, Lavinia Heisenberg, Gonzalo J. Olmo
We study a general class of gravitational theories formulated in the Palatini approach and derive the equations governing the evolution of tensor perturbations. In the absence of t…