299 citations · 610 across the 31 of their papers we have counts for
31 papers
Regular black holes with Minkowskian cores: causal structure and observational degeneracy
Francisco Tello-Ortiz, Y. Gómez-Leyton, Alejandro Rueda +2
We construct a new family of asymptotically flat static and rotating regular black holes characterized by a Minkowskian core and a finite two-horizon structure. The solutions are o…
Generalizing the interacting dilatonic ghost condensate as a dark energy model
Manuel Gonzalez-Espinoza, Ramon Herrera, Johan Casimiro
In this article, we study the cosmic evolution of a generalized dilatonic ghost condensate field as a dark energy candidate, formulated from a Lagrangian density with two dominant…
Horizon formation from effective matter profiles in static spacetimes
Pablo León, G. Alencar, Manuel Gonzalez-Espinoza +1
The formation of event horizons is traditionally studied as the endpoint of gravitational collapse, where the matter distribution and the spacetime geometry are evolved simultaneou…
Thermodynamic behavior of cosmological models with fractional entropy
Miguel Cruz, Diego da Silva, Simón González +3
We investigate the thermodynamic and phenomenological implications of a cosmological model governed by fractional entropy applied to the apparent horizon of a flat Friedmann-Lemaît…
Non-Schwarzschild black holes sourced by scalar-vector fields
Manuel Gonzalez-Espinoza, Y. Gómez-Leyton, Z. Stuchlik +1
In this work, we construct a static and spherically symmetric black hole solution sourced by a nonlinear scalar-vector sector within the framework of the Minimal Geometric Deformat…
Kaniadakis Holographic Dark Energy: UVIR Duality, Horizon Thermodynamics and Cosmological Constraints
Manuel Gonzalez-Espinoza, Samuel Lepe, Joel F. Saavedra +1
We investigate the cosmological and thermodynamic implications of holographic dark energy derived from the Kaniadakis deformation of the Bekenstein--Hawking entropy. In a spatially…
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 implications of Bumblebee theory on an FLRW background
Manuel Gonzalez-Espinoza, Grigorios Panotopoulos, Francisco Tello-Ortiz
We investigate some cosmological implications at background level of the Bumblebee model. The phase-space, the critical points and their stability are analyzed in detail applying w…
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…
Interacting dilatonic ghost condensate as dark energy model
Manuel Gonzalez-Espinoza, Ramón Herrera
In this paper, we examine the cosmological evolution of a dilatonic ghost condensate field responsible for dark energy, which interacts with dark matter through a source term. We e…
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…
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…
Inflation in a scalar-vector gravity theory
Manuel Gonzalez-Espinoza, Ramon Herrera
We study the possibility that inflation is driven by a scalar field together with a vector field minimally coupled to gravity. By assuming an effective potential that incorporates…
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…
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…
Odd-parity perturbations in the most general scalar-vector-tensor theory
Yolbeiker Rodríguez Baez, Manuel Gonzalez-Espinoza
In the context of the most general scalar-vector-tensor theory, we study the stability of static spherically symmetric black holes under linear odd-parity perturbations. We calcula…
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…
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…