34 citations · 185 across the 20 of their papers we have counts for
20 papers
MG-NECOLA: A Field-Level Emulator for Gravity and Massive Neutrino Cosmologies
J. Bayron Orjuela-Quintana, Mauricio Reyes, Elena Giusarma +3
Accurate modeling of non-linear gravitational dynamics is essential for constraining extensions to the standard cosmological model using large-scale structure observations. While h…
Multifield dark energy: Interplay between curved field space and curved spacetime
Diego Gallego, J. Bayron Orjuela-Quintana
Exponential quintessence models motivated by string compactifications naturally involve both a dilatonic scalar and its axionic partner evolving on a curved field space, while spat…
MG-NECOLA: Fast Neural Emulators for Modified Gravity Cosmologies
J. Bayron Orjuela-Quintana, Mauricio Reyes, Elena Giusarma +3
Observations of the large-scale structure (LSS) provide a powerful test of gravity on cosmological scales, but high-resolution N-body simulations of modified gravity (MG) are prohi…
Inconsistencies of Tsallis Cosmology within Horizon Thermodynamics and Holographic Scenarios
Pedro M. Ibarbo-Perlaza., J. Bayron Orjuela-Quintana, Jose L. Palacios-Córdoba +1
We investigate the cosmological implications of Tsallis entropy in two widely discussed frameworks: the Cai-Kim thermodynamic derivation of the Friedman equations and the Tsallis h…
Anisotropic Universes in Light of Background Cosmological Observations
Jose L. Palacios-Córdoba, J. Bayron Orjuela-Quintana, Gabriela A. Valencia-Zuñiga +1
The cosmological principle is a cornerstone of the standard cosmological model. However, recent observations suggest potential deviations from this assumption, hinting at a small a…
Dynamical Shortcomings in the Generalized SU(2) Proca Theory: Challenges for Cosmic Acceleration
Santiago Garcia-Serna, J. Bayron Orjuela-Quintana, Yeinzon Rodriguez +2
The Generalized SU(2) Proca (GSU2P) theory has recently garnered attention for its potential to describe key phases of cosmic evolution, including primordial inflation and late-tim…
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…
Interpretable and physics-informed emulator for the linear matter power spectrum from machine learning
J. Bayron Orjuela-Quintana, Domenico Sapone, Savvas Nesseris
We present an interpretable emulator for the linear matter power spectrum (MPS) in the standard cosmological model CDM, constructed via a physics-informed symbolic regression fr…
Anisotropic Dark Energy from String Compactifications
Diego Gallego, J. Bayron Orjuela-Quintana, César A. Valenzuela-Toledo
We explore the cosmological dynamics of a minimalistic yet generic string-inspired model for multifield dark energy. Adopting a supergravity four-dimensional viewpoint, we motivate…
Machine learning unveils the linear matter power spectrum of modified gravity
J. Bayron Orjuela-Quintana, Savvas Nesseris, Domenico Sapone
The matter power spectrum is one of the main quantities connecting observational and theoretical cosmology. Although for a fixed redshift this can be numerically computed ve…
Tracking the validity of the quasi-static and sub-horizon approximations in modified gravity
J. Bayron Orjuela-Quintana, Savvas Nesseris
Within the framework of modified gravity (MG), the quasi-static (QS) and sub-horizon (SH) approximations are widely used in analyses aiming to identify departures from the concorda…
Reconstructing the parameter space of non-analytical cosmological fixed points
Santiago García-Serna, J. Bayron Orjuela-Quintana, César A. Valenzuela-Toledo +1
Dynamical system theory is a widely used technique in the analysis of cosmological models. Within this framework, the equations describing the dynamics of a model are recast in ter…
Using machine learning to compress the matter transfer function
J. Bayron Orjuela-Quintana, Savvas Nesseris, Wilmar Cardona
The linear matter power spectrum connects theory with large scale structure observations in cosmology. Its scale dependence is entirely encoded in the matter transfer func…
An effective fluid description of scalar-vector-tensor theories under the sub-horizon and quasi-static approximations
Wilmar Cardona, J. Bayron Orjuela-Quintana, César A. Valenzuela-Toledo
We consider scalar-vector-tensor (SVT) theories with second-order equations of motion and tensor propagation speed equivalent to the speed of light. Under the sub-horizon and the q…
Late-Time Anisotropy Sourced by a 2-Form Field Non-Minimally Coupled to Cold Dark Matter
J. Bayron Orjuela-Quintana, Jose L. Palacios-Córdoba, César A. Valenzuela-Toledo
This paper investigates the cosmological dynamics arising from the interaction between a 2-form field and cold dark matter within a Bianchi I background. Employing a dynamical syst…
Anisotropic -essence
J. Bayron Orjuela-Quintana, César A. Valenzuela-Toledo
In this paper, we study the late time cosmology of a non-canonical scalar field (-essence) coupled to a vector field in a Bianchi-I background. Specifically, we study three case…
Anisotropic solid dark energy
J. Motoa-Manzano, J. Bayron Orjuela-Quintana, Thiago S. Pereira +1
In this paper, we study a triad of inhomogeneous scalar fields, known as "solid", as a source of homogeneous but anisotropic dark energy. By using a dynamical system approach, we f…
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…
Anisotropic Einstein Yang-Mills Higgs Dark Energy
J. Bayron Orjuela-Quintana, Miguel Alvarez, Cesar A. Valenzuela-Toledo +1
In the context of the dark energy scenario, the Einstein Yang-Mills Higgs model in the SO(3) representation was studied for the first time by M. Rinaldi (see JCAP 1510, 023 (2015))…
Einstein Yang-Mills Higgs dark energy revisited
Miguel Alvarez, J. Bayron Orjuela-Quintana, Yeinzon Rodriguez +1
Inspired in the Standard Model of Elementary Particles, the Einstein Yang-Mills Higgs action with the Higgs field in the SU(2) representation was proposed in Class. Quantum Grav. 3…