299 citations · 3.2k across the 129 of their papers we have counts for
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Solutions for neutron stars in General Relativity from a complexity structure scalar boundary condition
Robert S. Bogadi, Megandhren Govender, Genly Leon +1
A new condition involving the complexity factor, a structure scalar arising from the orthogonal splitting of the Riemann tensor, is generated at the boundary of a spherically symme…
Dynamics of the Bianchi~V cosmological model inspired by quintessential -attractors
Genly Leon, Amare Abebe, Andronikos Paliathanasis
We investigate scalar-field cosmologies in the Bianchi V spacetime using a dynamical-systems framework. Motivated by representative -attractor potentials - the E-model and T-mod…
Bianchi I spacetimes within 4D Einstein-Gauss-Bonnet scalar field theory
Alex Giacomini, Chevara Hansraj, Genly Leon +1
We investigate the evolution of anisotropies in Bianchi I spacetimes within the framework of the 4D Einstein-Gauss-Bonnet scalar field theory. The field equations are formulated us…
Averaging Dynamics of Scalar Field-Matter Interacting Models in Anisotropic Universes: The Locally Rotationally Symmetric Bianchi I Spacetime
Alfredo D. Millano, Genly Leon, Andronikos Paliathanasis
We consider an anisotropic cosmological model based on the locally rotational Bianchi I spacetime, incorporating a scalar field and a non-zero cosmological interaction term. The fr…
Challenging CDM with Higher-Order GUP Corrections
Andronikos Paliathanasis, Genly Leon, Yoelsy Leyva +2
We study quantum corrections to the CDM model model arising from a minimum measurable length in Heisenberg's uncertainty principle. We focus on a higher-order Generalized Uncert…
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…
Fractional Time-Delayed differential equations: Applications in Cosmological Studies
Bayron Micolta-Riascos, Byron Droguett, Gisel Mattar Marriaga +4
Fractional differential equations model processes with memory effects, providing a realistic perspective on complex systems. We examine time-delayed differential equations, discuss…
-cosmological dynamics in the FLRW background
Nikolaos Dimakis, Alex Giacomini, Genly Leon +3
We examine the cosmological dynamics of Einstein-Gauss-Bonnet gravity models in a four-dimensional spatially flat FLRW metric. These models are described by $f\left( R,\mathcal{G}\…
Cosmological phase-space analysis of -theories of gravity
Giannis Papagiannopoulos, Orlando Luongo, Genly Leon +1
The impact of topological terms that modify the Hilbert-Einstein action is here explored by virtue of a further contribution. In particular, we investigate the phase-space s…
Noether Symmetries in Cosmology
Konstantinos F. Dialektopoulos, Genly Leon, Andronikos Paliathanasis
We apply the Noether symmetry analysis in -Cosmology to determine invariant functions and conservation laws for the cosmological field equations. For the FLRW bac…
Cosmological Interactions with Phantom Scalar Field: Revisiting Background Phase-Space Analysis with Compactified Variables
Genly Leon, Daya Shankar, Amlan Halder +1
Energy transfer in the dark sector of the universe gives rise to new phenomena of special interest in modern cosmology. When dark energy is modeled as a phantom scalar field, inter…
Avoiding Big Rip Singularities in Phantom Scalar Field theory with Gauss-Bonnet term
Giannis Papagiannopoulos, Genly Leon, Andronikos Paliathanasis
We consider a phantom scalar field coupled to the Gauss-Bonnet scalar within a spatially flat FLRW geometry. Moreover, we assume a nonzero interaction between the scalar field and…
Revise the Dark Matter-Phantom Scalar Field Interaction
Andronikos Paliathanasis, Amlan Halder, Genly Leon
The cosmological history and evolution are examined for gravitational models with interaction in the dark sector of the universe. In particular, we consider the dark energy to be d…
Bianchi I spacetimes in -gravity
Andronikos Paliathanasis, Genly Leon
The Kasner spacetimes are exact solutions that are self-similar and of significant interest because they can describe the dynamic evolution of kinematic variables near the singular…
Dynamics of a higher-dimension Einstein-Scalar-Gauss-Bonnet cosmology
Alfredo D. Millano, Claudio Michea, Genly Leon +1
We study the dynamics of the field equations in a five-dimensional spatially flat Friedmann-Lemaître-Robertson-Walker metric in the context of a Gauss-Bonnet-Scalar field theory wh…
Conformal and Non-Minimal Couplings in Fractional Cosmology
Kevin Marroquín, Genly Leon, Alfredo D. Millano +2
Fractional differential calculus is a mathematical tool that has found applications in the study of social and physical behaviors considered ``anomalous''. It is often used when tr…
Mapping Solutions in Nonmetricity Gravity: Investigating Cosmological Dynamics in Conformal Equivalent Theories
Nikolaos Dimakis, Kevin Duffy, Alex Giacomini +3
We investigate the impact of conformal transformations on the physical properties of solution trajectories in nonmetricity gravity. Specifically, we explore the phase-space and rec…
Averaging generalized scalar field cosmologies IV: locally rotationally symmetric Bianchi V model
Alfredo D. Millano, Genly Leon
This research focuses on scalar field cosmologies with a generalized harmonic potential. Our attention is centred on the anisotropic LRS Bianchi I and III metrics, Bianchi V metric…
Global dynamics of two models for Quintom Friedman-Lemaître-Robertson-Walker Universes
Genly Leon, Alan Coley, Andronikos Paliathanasis +2
We comprehensively analyze the dynamics for the gravitational field equations for the Chiral-Quintom theory in a Friedman-Lemaître-Robertson-Walker cosmology with an additional mat…
Dynamical system analysis in multiscalar-torsion cosmology
Genly Leon, Andronikos Paliathanasis, Alfredo D. Millano
We explore the phase-space of a multiscalar-torsion gravitational theory within a cosmological framework characterized by a spatially flat Friedmann-Lema\^ıtre-Robertson-Walker mod…
Cosmology under the fractional calculus approach: a possible tension resolution?
Genly Leon, Miguel A. García-Aspeitia, Guillermo Fernandez-Anaya +3
Recently, a new field of study called fractional cosmology has emerged. It uses fractional calculus to modify the standard derivative equations and change the Friedmann equations.…
Global dynamics in Einstein-Gauss-Bonnet scalar field cosmology with matter
Alfredo D. Millano, Genly Leon, Andronikos Paliathanasis
We study the dynamics of the field equations in a four-dimensional isotropic and homogeneous spatially flat Friedmann--Lema\^ıtre--Robertson--Walker geometry in the context of Eins…
Dark Universe Phenomenology from Yukawa Potential?
Kimet Jusufi, Genly Leon, Alfredo D. Millano
We argue that the effect of cold dark matter in the cosmological setup can be explained by the coupling between the baryonic matter particles in terms of the long-range force havin…
Exact solutions and cosmological constraints in fractional cosmology
Esteban González, Genly Leon, Guillermo Fernandez-Anaya
This paper investigates exact solutions of cosmological interest in fractional cosmology. Given , the order of Caputo's fractional derivative, and , the matter equation of st…