19 citations · 89 across the 15 of their papers we have counts for
15 papers
Conformally Interacting Dark Energy with Early and Late-Time Measurements
Shambel Sahlu, Abunie Gezahegn, Amare Abebe +2
The conformal interacting dark energy (CIDE) model is investigated by introducing a scalar field representing dark energy (DE) coupled to dark matter (DM) via a conformal transform…
From Timbuktu to SKA: Who owns the Astronomy knowledge Africa produces?
Rhea Koch, Amare Abebe
Africa has deep and diverse traditions of astronomical knowledge, ranging from archaeological astronomy, pharaonic stellar timekeeping, and manuscript astronomy in Timbuktu and the…
Dynamical dark energy in the Bianchi Type-V Universe with DESI DR2 BAO, SNIa compilation and RSD measurements
Shambel Sahlu, Álvaro de la Cruz-Dombriz, A. H. A. Alfedeel +2
We investigate the cosmological implications of dynamical dark energy (DDE) models within an anisotropic, spatially homogeneous Bianchi Type-V spacetime framework using a cov…
Kosmulator: A Python framework for cosmological inference with MCMC
Renier T. Hough, Robert Rugg, Shambel Sahlu +1
We present Kosmulator, a modular and vectorised Python framework designed to accelerate the statistical testing of cosmological models. As the theoretical landscape expands beyond…
Study of dynamical systems and large-scale structure
Dumiso Mithi, Saikat Charkraborty, Shambel Sahlu +1
In this study, we employ dynamical systems methods to analyse the large-scale structure by considering two distinct interaction models (linear and non-linear) within the dark secto…
Late-time Background Constraints on Linear and Non-linear Interacting Dark Energy after DESI DR2
David Figueruelo, Marcel van der Westhuizen, Amare Abebe +1
In this study, we present observational constraints on a class of phenomenological interacting dark energy (IDE) models that admit analytical solutions for the Hubble parameter $H(…
III. Interacting Dark Energy: Summary of Models, Pathologies, and Constraints
Marcel van der Westhuizen, Amare Abebe, Eleonora Di Valentino
We present an overview of the main results from our two companion papers that are relevant for observational constraints on interacting dark energy (IDE) models. We provide analyti…
I. Linear Interacting Dark Energy: Analytical Solutions and Theoretical Pathologies
Marcel van der Westhuizen, Amare Abebe, Eleonora Di Valentino
Interacting dark energy (IDE) models, in which dark matter (DM) and dark energy (DE) exchange energy through a non-gravitational interaction, have long been proposed as candidates…
II. Non-Linear Interacting Dark Energy: Analytical Solutions and Theoretical Pathologies
Marcel van der Westhuizen, Amare Abebe, Eleonora Di Valentino
We investigate interacting dark energy (IDE) models with phenomenological, non-linear interaction kernels , specifically $Q_{1}=3Hδ\left(\frac{ρ_{\rm dm}ρ_{\rm de}}{ρ_{\rm dm}+ρ…
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…
Compartmentalization in the Dark Sector of the Universe after DESI DR2 BAO data
Marcel van der Westhuizen, David Figueruelo, Rethabile Thubisi +3
We consider a non-linear interaction between the dark matter and dark energy components of the universe. In particular, within the FLRW geometry, where dark matter is described by…
Constraining the modified symmetric teleparallel gravity using cosmological data
Shambel Sahlu, Amare Abebe
This paper examines the late-time accelerating Universe and the formation of large-scale structures within the modified symmetric teleparallel gravity framework, specifically using…
Constraining viscous fluid models in gravity with data
Shambel Sahlu, Renier T. Hough, Amare Abebe +1
We investigate the impact of bulk viscosity on the accelerating expansion and large-scale structure formation of a Universe in which the underlying gravitational interaction is des…
The cosmology of gravity: constraining the background and perturbed dynamics
Shambel Sahlu, Alnadhief H. A. Alfedeel, Amare Abebe
This paper delves into the late-time accelerated expansion of the universe and the evolution of cosmic structures within the context of a specific \( f(R, L_m) \) gravity model, fo…
Structure growth in cosmology
Shambel Sahlu, Álvaro de la Cruz-Dombriz, Amare Abebe
We take into account redshift-space distortion measurements to investigate the growth of cosmological large-scale structures within the framework of modified symmetric teleparallel…