Explanipedia

Cosmological interactions with phantom scalar field: Revisiting background phase-space analysis with compactified variables Open

Genly León, D. Shankar, Amlan K. Halder, Andronikos Paliathanasis · 2025

Challenging $Λ$CDM with Higher-Order GUP Corrections Open

Andronikos Paliathanasis, Genly León, Yoelsy Leyva, Giuseppe Gaetano Luciano, Amare Abebe · 2025

We study quantum corrections to the $Λ$CDM model model arising from a minimum measurable length in Heisenberg's uncertainty principle. We focus on a higher-order Generalized Uncertainty Principle, beyond the quadratic form. This generalize…

Averaging Dynamics of Scalar Field-Matter Interacting Models in Anisotropic Universes: The Locally Rotationally Symmetric Bianchi I Spacetime Open

Alfredo D. Millano, Genly León, Andronikos Paliathanasis · 2025

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 framework of averaging theory is employed to study the associ…

Revise the dark matter-phantom scalar field interaction Open

Andronikos Paliathanasis, Amlan K. Halder, Genly León · 2025

The cosmological history and evolution are examined for gravitational models that include interaction within the dark sector of the Universe. In particular, we consider dark energy to be described by a phantom scalar field, while dark matt…

Fractional Time-Delayed Differential Equations: Applications in Cosmological Studies Open

Bayron Micolta-Riascos, Byron Droguett, Gisel Mattar Marriaga, Genly León, Andronikos Paliathanasis , et al. · 2025

Fractional differential equations model processes with memory effects, providing a realistic perspective on complex systems. We examine time-delayed differential equations, discussing first-order and fractional Caputo time-delayed differen…

Cosmological phase-space analysis of f(G)-theories of gravity Open

G. Papagiannopoulos, Orlando Luongo, Genly León, Andronikos Paliathanasis · 2025

$f(R,\mathcal{G})$-cosmological dynamics in the FLRW background Open

N. Dimakis, Alex Giacomini, Genly León, Andronikos Paliathanasis, E. O. Pozdeeva , et al. · 2025

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}\right) =f\left( R+μ\mathcal{G}\right) $ theory of gravity. …

Cosmological phase-space analysis of $f(G)$-theories of gravity Open

G. Papagiannopoulos, Orlando Luongo, Genly León, Andronikos Paliathanasis · 2025

The impact of topological terms that modify the Hilbert-Einstein action is here explored by virtue of a further $f(G)$ contribution. In particular, we investigate the phase-space stability and critical points of an equivalent scalar field …

Noether Symmetries in $f(Q)-$Cosmology Open

Konstantinos F. Dialektopoulos, Genly León, Andronikos Paliathanasis · 2025

We apply the Noether symmetry analysis in $f\left( Q\right)$-Cosmology to determine invariant functions and conservation laws for the cosmological field equations. For the FLRW background and the four families of connections, it is found t…

Avoiding Big Rip Singularities in Phantom Scalar Field theory with Gauss-Bonnet term Open

G. Papagiannopoulos, Genly León, Andronikos Paliathanasis · 2025

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 the matter term. We perform a detailed phase space analysis…

Cosmological Interactions with Phantom Scalar Field: Revisiting Background Phase-Space Analysis with Compactified Variables Open

Genly León, D. Shankar, Amlan K. Halder, Andronikos Paliathanasis · 2025

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, interactions become crucial to avoid Big Rip singularities. In t…

Revise the Dark Matter-Phantom Scalar Field Interaction Open

Andronikos Paliathanasis, Amlan K. Halder, Genly León · 2024

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 described by a phantom scalar field and the dark matter $ρ_{…

Fractional Einstein–Gauss–Bonnet Scalar Field Cosmology Open

Bayron Micolta-Riascos, Alfredo D. Millano, Genly León, Byron Droguett, Esteban González , et al. · 2024

Our paper introduces a new theoretical framework called the Fractional Einstein–Gauss–Bonnet scalar field cosmology, which has important physical implications. Using fractional calculus to modify the gravitational action integral, we deriv…

Dynamics of a higher-dimensional Einstein–Scalar–Gauss–Bonnet cosmology Open

Alfredo D. Millano, Claudio Michea, Genly León, Andronikos Paliathanasis · 2024

Bianchi I spacetimes in $f\left(Q\right)$-gravity Open

Andronikos Paliathanasis, Genly León · 2024

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 singularity of the Mixmaster universe. The chaotic behavior of the …

Conformal and Non-Minimal Couplings in Fractional Cosmology Open

Kevin L. Marroquin, Genly León, Alfredo D. Millano, Claudio Michea, Andronikos Paliathanasis · 2024

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 traditional integer derivatives models fail to represent cases …

Addressing the Hubble tension in Yukawa cosmology? Open

Kimet Jusufi, Esteban González, Genly León · 2024

In Yukawa cosmology, a recent discovery revealed a relationship between baryonic matter and the dark sector. The relation is described by the parameter α and the long-range interaction parameter λ - an intrinsic property of the graviton. A…

Charged Black Holes with Yukawa Potential Open

A. A. Araújo Filho, Kimet Jusufi, Bertha Cuadros-Melgar, Genly León, Abdul Jawad · 2024

This study derives a novel family of charged black hole solutions featuring short- and long-range modifications. These ones are achieved through a Yukawa-like gravitational potential modification and a nonsingular electric potential incorp…

Averaging generalized scalar field cosmologies IV: locally rotationally symmetric Bianchi V model Open

Alfredo D. Millano, Genly León · 2024

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 metrics, and their isotropic limits. We provide a comprehensive o…

Mapping Solutions in Nonmetricity Gravity: Investigating Cosmological Dynamics in Conformal Equivalent Theories Open

N. Dimakis, Kevin J. Duffy, Alex Giacomini, Alexander Yu. Kamenshchik, Genly León , et al. · 2023

We investigate the impact of conformal transformations on the physical properties of solution trajectories in nonmetricity gravity. Specifically, we explore the phase-space and reconstruct the cosmological history of a spatially flat Fried…

Dark matter signatures of black holes with Yukawa potential Open

A. A. Araújo Filho, Kimet Jusufi, Bertha Cuadros-Melgar, Genly León · 2023

This study uses a nonsingular Yukawa--modified potential to obtain a static and spherically symmetric black hole solution with a cosmological constant. Such Yukawa--like corrections are encoded in two parameters, $α$ and $λ$, that modify N…

Averaging generalized scalar field cosmologies IV: locally rotationally symmetric Bianchi V model Open

Alfredo D. Millano, Genly León · 2023

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 metrics, and their isotropic limits. We provide a comprehensive o…

Dark Universe phenomenology from Yukawa potential? Open

Kimet Jusufi, Genly León, Alfredo D. Millano · 2023

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 having a graviton mass mg via the Yukawa gravitational potential…

Global dynamics of two models for Quintom Friedman-Lemaître-Robertson-Walker Universes Open

Genly León, A. A. Coley, Andronikos Paliathanasis, Jonathan Tot, Balkar Yildirim · 2023

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 matter source. We consider a new set of dimensionless variable…

Observational constraints on Yukawa cosmology and connection with black hole shadows Open

Esteban González, Kimet Jusufi, Genly León, Emmanuel N. Saridakis · 2023

We confront Yukawa modified cosmology, proposed in arXiv:2304.11492 [Jusufi et al. arXiv:2304.11492], with data from Supernovae Type Ia (SNe Ia) and Hubble parameter (OHD) observations. Yukawa cosmology is obtained from a Yukawa-like gravi…

Scalar Field Evolution at Background and Perturbation Levels for a Broad Class of Potentials Open

Genly León, Saikat Chakraborty, Sayantan Ghosh, Raja Solanki, P. K. Sahoo , et al. · 2023

In this paper, a non‐interacting scalar field cosmology with an arbitrary potential using the f ‐deviser method that relies on the differentiability properties of the potential is investigated. Using this alternative mathematical approach,…

Dynamical system analysis in multiscalar-torsion cosmology Open

Genly León, Andronikos Paliathanasis · 2023

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 model. Our investigation focuses on teleparallelism and involv…

Observational constraints on Yukawa cosmology and connection with black hole shadows Open

Esteban González, Kimet Jusufi, Genly León, Emmanuel N. Saridakis · 2023

We confront Yukawa modified cosmology, proposed in arXiv:2304.11492 [Jusufi et al. arXiv:2304.11492], with data from Supernovae Type Ia (SNe Ia) and Hubble parameter (OHD) observations. Yukawa cosmology is obtained from a Yukawa-like gravi…

Inflation driven by non-linear electrodynamics Open

H. Benaoum, Genly León, Ali Övgün, Hernando Quevedo · 2023

We investigate the inflation driven by a nonlinear electromagnetic field based on an NLED lagrangian density $${\mathscr {L}}_{\text {nled}} = - {F} f \left( {F} \right) $$ , where $$f \left( {F}\right) $$ is a general func…

Exact Solutions and Cosmological Constraints in Fractional Cosmology Open

Esteban González, Genly León, Guillermo Fernández‐Anaya · 2023

This paper investigates exact solutions of cosmological interest in fractional cosmology. Given μ, the order of Caputo’s fractional derivative, and w, the matter equation of state, we present specific exact power-law solutions. We discuss …

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