306 citations · 1.1k across the 39 of their papers we have counts for
39 papers
Primordial black hole production in scalar field inflation within gravity
Daniel Villalobos-Silva, Yerko Vásquez, Giovanni Otalora
We investigate inflation in modified teleparallel gravity within a scalar-tensor framework. We focus on two viable extensions of the Teleparallel Equivalent of General Relativity:…
Non-minimally coupled loop quantum inflation with inverse-volume corrections
Rudranil Roy, Giovanni Otalora, Joel Saavedra +1
We study slow-roll inflation driven by a scalar field non-minimally coupled to gravity within the effective framework of Loop Quantum Cosmology (LQC), including inverse-volume corr…
Higgs-like inflation in scalar-torsion gravity in light of ACT-SPT-DESI constraints
Nitesh Kumar, Giovanni Otalora, Rodrigo Reyes +3
We study Higgs-like inflation in the framework of scalar-torsion gravity, focusing on the general class of theories in which gravitation is mediated by torsion rather than…
Cosmological dynamics of interacting dark matter-dark energy in generalized Rastall gravity
Manuel Gonzalez-Espinoza, Ramón Herrera, Giovanni Otalora +2
In this work, we investigate late-time interacting cosmologies within the framework of generalized Rastall gravity, where the interaction arises naturally from the non-conservation…
Slow-Fast Evolution of Scalar Fields in Higher-Order Cosmological Gravity: Dynamics Inspired by the Pais--Uhlenbeck Oscillator
Manuel Gonzalez-Espinoza, Genly Leon, Yoelsy Leyva +3
We investigate the cosmological dynamics of scalar fields governed by higher-order gravity, with particular emphasis on models inspired by the Pais-Uhlenbeck oscillator--a prototyp…
Late-time acceleration and structure formation in interacting -attractor dark energy models
L. K. Duchaniya, B. Mishra, G. Otalora +1
We investigate the cosmological dynamics of interacting dark energy within the framework of -attractor models. Specifically, we analyze the associated autonomous system, focusin…
The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
Eleonora Di Valentino, Jackson Levi Said, Adam Riess +533
The standard model of cosmology has provided a good phenomenological description of a wide range of observations both at astrophysical and cosmological scales for several decades.…
Classical and quantum cosmology of gravity's rainbow in Schutz's formalism
Andrés Burton-Villalobos, Giovanni Otalora, Manuel Gonzalez-Espinoza +1
We investigate the classical and quantum dynamics of gravity's rainbow in the presence of a perfect fluid, employing Schutz's formalism to establish a well-defined notion of…
Exploring the Dark Age: Star and Galaxy formation in the Early Universe
K. El Bourakadi, G. Otalora
The Cosmic Dark Ages mark a pivotal era of the universe's evolution, transitioning from a neutral, opaque medium to the emergence of the first stars and galaxies that initiated cos…
Cosmological Dynamics in Interacting Scalar-Torsion f(T,) Gravity: Investigating Energy and Momentum Couplings
Carlos Rodriguez-Benites, Manuel Gonzalez-Espinoza, Giovanni Otalora +1
We investigate the cosmological dynamics of a homogeneous scalar field non-minimally coupled to torsion gravity, which also interacts with cold dark matter through energy and momen…
Insights into Gravitinos Abundance, Cosmic Strings and Stochastic Gravitational Wave Background
K. El Bourakadi, G. Otalora, A. Burton-Villalobos +3
In this paper, we investigate D-term inflation within the framework of supergravity, employing the minimal Kähler potential. Following previous studies that revealed that this mode…
Screening fifth forces in scalar-vector-tensor theories
Manuel Gonzalez-Espinoza, Giovanni Otalora, Lucila Kraiselburd +1
We study a screening mechanism in the context of scalar-vector-tensor (SVT) theories. This screening mechanism is based on both the derivative self-interactions of the vector field…
Revisiting the dynamics of interacting vector-like dark energy
Carlos Rodriguez-Benites, Manuel Gonzalez-Espinoza, Giovanni Otalora +1
We revise the dynamics of interacting vector-like dark energy, a theoretical framework proposed to explain the accelerated expansion of the universe. By investigating the interacti…
Phase-space analysis of torsion-coupled dilatonic ghost condensate
Manuel Gonzalez-Espinoza, Giovanni Otalora, Yoelsy Leyva +1
We studied the cosmological dynamics of a dilatonic ghost condensate field as a source of dark energy, which is non-minimally coupled to gravity through torsion. We performed a det…
Constant-roll and primordial black holes in f(Q,T) gravity
K. El Bourakadi, M. Koussour, G. Otalora +2
In this study, we investigate the consequence of the constant-roll condition and examine the role of gravity in the cosmological inflation process. We analyze the inflatio…
Dynamics of dark energy in a scalar-vector-torsion theory
Manuel Gonzalez-Espinoza, Giovanni Otalora, Yoelsy Leyva +1
We study the cosmological dynamics of dark energy in a scalar-vector-torsion theory. The vector field is described by the cosmic triad and the scalar field is of the quintessence t…
Effective dark energy through spin-gravity coupling
Giovanni Otalora, Emmanuel N. Saridakis
We investigate cosmological scenarios with spin-gravity coupling. In particular, due to the spin of the baryonic and dark matter particles and its coupling to gravity, they probe a…
Revisiting gravity's rainbow: Inflation and primordial fluctuations
Yoelsy Leyva, Giovanni Otalora
We study inflation and the generation of primordial fluctuations in gravity's rainbow. We calculate the cosmological perturbations and then the scalar and tensor primordial…
Parametrized post-Newtonian formalism in higher-order Teleparallel Gravity
Manuel Gonzalez-Espinoza, Giovanni Otalora, Lucila Kraiselburd +1
We study the parametrized post-Newtonian (PPN) limit of higher-derivative-torsion Modified Teleparallel Gravity. We start from the covariant formulation of modified Teleparallel Gr…
Inflation and Primordial Fluctuations in Gravity's Rainbow
Yoelsy Leyva, Carlos Leiva, Giovanni Otalora +1
We study slow-roll inflation and the generation of primordial fluctuations in gravity's rainbow. We obtain the second order action for scalar and tensor perturbations and th…
Chaotic Inflation and Reheating in Generalized Scalar-Tensor Gravity
Matías López, Giovanni Otalora, Nelson Videla
In the present work, we study slow-roll inflation in scalar-tensor gravity theories in the presence of both the non-minimal coupling between the scalar field and curvature, and the…
Reconstructing inflation in scalar-torsion gravity
Manuel Gonzalez-Espinoza, Ramón Herrera, Giovanni Otalora +1
It is investigated the reconstruction during the slow-roll inflation in the most general class of scalar-torsion theories whose Lagrangian density is an arbitrary function …
Stability of scalar perturbations in scalar-torsion gravity theories in the presence of a matter fluid
Manuel Gonzalez-Espinoza, Giovanni Otalora, Joel Saavedra
We study the viability conditions for the absence of ghost, gradient and tachyonic instabilities, in scalar-torsion gravity theories in the presence of a general barotropi…
Cosmological dynamics of dark energy in scalar-torsion gravity
Manuel Gonzalez-Espinoza, Giovanni Otalora
It is investigated the cosmological dynamics of scalar-torsion gravity as a dark energy model, where is the torsion scalar of teleparallel gravity and is a canonic…