56 citations · 90 across the 11 of their papers we have counts for
11 papers
Physical nonviability of in the scalar-tensor representation
Jose Beltrán Jiménez, Alejandro Jiménez Cano, Tomi S. Koivisto
We show the known pathological character of gravity in its scalar-tensor representation.
A solid unification of the dark sector
Jose Beltrán Jiménez, María Pérez Garrote, Florencia A. Teppa Pannia +1
We construct a unified description of dark matter and dark energy in terms of a single dark component that behaves as a pressureless fluid in the early Universe and undergoes a tra…
Euclidean teleparallel relativity and black hole partition functions
Jose Beltrán Jiménez, Tomi S. Koivisto
The Euclidean path integral approach to quantum gravity is conventionally formulated in terms of the Einstein-Hilbert-York-Gibbons-Hawking action, which requires suitable subtracti…
On Evidence for Elastic Interactions in the Dark Sector
Jose Beltrán Jiménez, Dario Bettoni, David Figueruelo +1
The increasing quality of cosmological data has revealed some tensions that could be signalling the necessity of incorporating new physics into our cosmological model. One particul…
Resilience of DBI screened objects and their ladder symmetries
Jose Beltrán Jiménez, Dario Bettoni, Philippe Brax
Scalar field theories with a shift symmetry come equipped with the -mouflage (or kinetic screening) mechanism that suppresses the scalar interaction between massive objects belo…
A class of ghost-free theories in symmetric teleparallel geometry
Antonio G. Bello-Morales, Jose Beltrán Jiménez, Alejandro Jiménez Cano +2
Theories formulated in the arena of teleparallel geometries are generically plagued by ghost-like instabilities or other pathologies that are ultimately caused by the breaking of s…
On the (non-)degeneracy of massive neutrinos and elastic interactions in the dark sector
Jose Beltrán Jiménez, David Figueruelo, Florencia Anabella Teppa Pannia
Cosmological models featuring an elastic interaction in the dark sector at linear order has been shown to provide a promising scenario for alleviating the tension. A natural…
Non-trivial thick brane realisations with 3-forms
Bruno J. Barros, Jose Beltrán Jiménez
We explore the construction of four-dimensional thick branes supported by massless 3-forms in a five-dimensional bulk space. The required residual Poincaré symmetry on the brane is…
Pathological Character of Modifications to Coincident General Relativity: Cosmological Strong Coupling and Ghosts in $f(\Q)$ Theories
Débora Aguiar Gomes, Jose Beltrán Jiménez, Alejandro Jiménez Cano +1
The intrinsic presence of ghosts in the symmetric teleparallel framework is elucidated. We illustrate our general arguments in theories by studying perturbations in…
Listening to Celestial Algebras
Jose Beltrán Jiménez, Tomi S. Koivisto
In this essay, we immerse into the framework of normed division algebras as a suitable arena to accommodate the standard model of elementary particles, and we explore some applicat…
Probing elastic interactions in the dark sector and the role of
Jose Beltrán Jiménez, Dario Bettoni, David Figueruelo +2
We place observational constraints on two models within a class of scenarios featuring an elastic interaction between dark energy and dark matter that only produces momentum exchan…