70 citations · 269 across the 12 of their papers we have counts for
4 papers · 1 filter
Multifield curved solid: Early dark energy and perturbation instabilities
Juan P. Beltrán Almeida, Alejandro Guarnizo, Thiago S. Pereira +1
We introduce a multifield dark energy model with a nonflat field-space metric, in which one field is dynamical while the others have constant spatial gradients. The model is predic…
Arbitrarily coupled forms in cosmological backgrounds
Juan P. Beltrán Almeida, Alejandro Guarnizo, César A. Valenzuela-Toledo
In this paper we consider a model based on interacting forms and explore some cosmological applications. Restricting to gauge invariant actions, we build a general Lagrangian a…
Semi-analytical Study on the Generic Degeneracy for Galaxy Clustering Measurements
Alejandro Guarnizo, Luca Amendola, Martin Kunz +1
From the galaxy power spectrum in redshift space, we derive semi-analytical results on the generic degeneracy of galaxy clustering measurements. Defining the observables $\bar{A}=…
Model-independent constraints on the cosmological anisotropic stress
Luca Amendola, Simone Fogli, Alejandro Guarnizo +2
The effective anisotropic stress or gravitational slip is a key variable in the characterisation of the physical origin of the dark energy, as it allows to test for a non-…