134 citations · 282 across the 5 of their papers we have counts for
8 papers
Moving superfluids in the rotating universe
Jose Beltrán Jiménez, Federico Piazza, Javier Vecino
We study homogeneous cosmological models featuring shift-symmetric scalar fields (or, superfluids) in relative motion. In the presence of anisotropy this universe generally feature…
Horndeski in motion
J. Bayron Orjuela-Quintana, Jose Beltrán Jiménez
We study a class of homogeneous but anisotropic cosmologies within the family of shift-symmetric Horndeski theories, where the scalar field features an inhomogeneous profile but it…
Mimicking wormholes in Born-Infeld electrodynamics
Jose Beltrán Jiménez, Luis J. Garay, María Pérez Garrote
We compute the evolution of linear perturbations on top of a background solution of a general nonlinear electromagnetic theory. This evolution can be described in terms of two effe…
Accidental gauge symmetries of Minkowski spacetime in Teleparallel theories
Jose Beltrán Jiménez, Tomi S. Koivisto
In this paper, we provide a general framework for the construction of the Einstein frame within non-linear extensions of the teleparallel equivalents of General Relativity. These i…
J-PAS: Forecasts for dark matter - dark energy elastic couplings
David Figueruelo, Miguel Aparicio Resco, Florencia A. Teppa Pannia +21
We consider a cosmological model where dark matter and dark energy feature a coupling that only affects their momentum transfer in the corresponding Euler equations. We perform a f…
General Teleparallel Quadratic Gravity
Jose Beltrán Jiménez, Lavinia Heisenberg, Damianos Iosifidis +2
In this Letter we consider a general quadratic parity-preserving theory for a general flat connection. Imposing a local symmetry under the general linear group singles out the gene…
The Geometrical Trinity of Gravity
Jose Beltran Jimenez, Lavinia Heisenberg, Tomi S. Koivisto
The geometrical nature of gravity emerges from the universality dictated by the equivalence principle. In the usual formulation of General Relativity, the geometrisation of the gra…
Ghosts in metric-affine higher order curvature gravity
Jose Beltrán Jiménez, Adria Delhom
We disprove the widespread belief that higher order curvature theories of gravity in the metric-affine formalism are generally ghost-free. This is clarified by considering a sub-cl…