70 citations · 269 across the 12 of their papers we have counts for
12 papers
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…
Dynamical analysis of cosmological models with non-Abelian gauge vector fields
Alejandro Guarnizo, J. Bayron Orjuela-Quintana, César A. Valenzuela-Toledo
In this paper we study some models where non-Abelian gauge vector fields endowed with a SU(2) group representation are the unique source of inflation and dark energy. These models…
Topological mass generation and forms
Juan P. Beltrán Almeida, Alejandro Guarnizo, Lavinia Heisenberg +2
In this work we revisit the topological mass generation of 2-forms and establish a connection to the unique derivative coupling arising in the quartic Lagrangian of the systematic…
-form quintessence: exploring dark energy of forms coupled to a scalar field
Alejandro Guarnizo, Juan P. Beltrán Almeida, César A. Valenzuela-Toledo
We consider a model based on form kinetic Lagrangians in the context of dark energy. The Lagrangian of the model is built with kinetic terms of the field strength for each -…
Anisotropic -form dark energy
Juan P. Beltrán Almeida, Alejandro Guarnizo, Ryotaro Kase +2
We study the dynamics of dark energy in the presence of a 2-form field coupled to a canonical scalar field . We consider the coupling proportional to $e^{-μϕ/M_{\rm pl}} H_{αβγ}…
Anisotropic inflation with coupled -forms
Juan P. Beltrán Almeida, Alejandro Guarnizo, Ryotaro Kase +2
We study the cosmology in the presence of arbitrary couplings between -forms in 4-dimensional space-time for a general action respecting gauge symmetry and parity invariance. Th…
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}=…
Erratum to: Geodesic Deviation Equation in f(R) Gravity
Alejandro Guarnizo, Leonardo Castaneda, Juan M. Tejeiro
In the context of metric gravity, the Geodesic Deviation Equation (GDE) was first studied in arXiv:1010.5279v3, giving a general expression and studying a particular case, t…
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-…
Geodesic Deviation Equation in f(R) Gravity
Alejandro Guarnizo, Leonardo Castaneda, Juan M. Tejeiro
In this paper we study the Geodesic Deviation Equation (GDE) in metric f(R) gravity. We start giving a brief introduction of the GDE in General Relativity in the case of the standa…
Boundary Term in Metric f(R) Gravity: Field Equations in the Metric Formalism
Alejandro Guarnizo, Leonardo Castaneda, Juan M. Tejeiro
The main goal of this paper is to get in a straightforward form the field equations in metric f(R) gravity, using elementary variational principles and adding a boundary term in th…