132 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Mbarara University of Science and TechnologyUG15 papers
- Ethiopian Space Science and Technology InstituteET11 papers
- ICTP - East Africa Institute for Fundamental ResearchRW8 papers
- Instituto de Astrofísica de AndalucíaES8 papers
- University of KigaliRW7 papers
- North-West UniversityZA6 papers
- Centre National de la Recherche ScientifiqueFR5 papers
- Korea Institute for Advanced StudyKR5 papers
- University of Cape TownZA5 papers
- University of OxfordGB5 papers
- Institut d'Astrophysique de ParisFR4 papers
- Sorbonne UniversitéFR4 papers
13 papers · 1 filter
Testing Gauss-Bonnet Gravity with DESI BAO Data
Praveen Kumar Dhankar, Dalale Mhamdi, Albert Munyeshyaka +3
In the present paper, we observationally constrain f (G) gravity at the background level using Type Ia supernovae from the Pantheon Plus (PP) sample, cosmic chronometer (CC) data,…
Matter power spectrum in a power-law gravity
Albert Munyeshyaka, Praveen Kumar Dhankar, Joseph Ntahompagaze
Cosmological models based on gravity are efficient in fitting different observational datasets at both background and perturbation levels. This motivates the current study t…
Perturbations with bulk viscosity in modified chaplygin gas cosmology
Albert Munyeshyaka, Praveen Kumar Dhankar, Joseph Ntahompagaze
In the present work, we investigate cosmological perturbations of viscous modified chaplygin gas model. Using 1 + 3 covariant formalism, we define covariant and gauge invariant gra…
On 1 + 3 covariant perturbations of the quasi-Newtonian space-time in modified Gauss-Bonnet gravity
Albert Munyeshyaka, Joseph Ntahompagaze, Tom Mutabazi +1
The consideration of a 1 + 3 covariant approach to cold dark matter universe with no shear cosmological dust model with irrotational flows is developed in the context of f (G) grav…
Is cosmic dynamics self-regulating?
Manasse R. Mbonye
In this paper we discuss a cosmological model for a universe with self-regulating features. We set up the theoretical framework for the model and determine the time evolution of th…
Perturbations in the interacting vacuum
Albert Munyeshyaka, Joseph Ntahompagaze, Tom Mutabazi +4
In this study, we present the evolution of cosmological perturbations in a universe consisting of standard matter and interacting vacuum. We use the covariant formalism in…
Multifluid cosmology in f (G) gravity
Albert Munyeshyaka, Abraham Ayirwanda, Fidele Twagirayezu +1
The treatment of 1 + 3 covariant perturbation in a multifluid cosmology with the consideration of f (G) gravity, G being the Gauss-Bonnet term, is done in the present paper. We def…
On inflationary parameters in scalar-tensor theories
Beatrice Murorunkwere, Fidele Twagirayezu, Albert Munyeshyaka +2
The equivalence between and scalar-tensor theories is revisited, we consequently explored different models. After consideration of specific definition of the scalar f…
Large-scale structure power spectrum from scalar-tensor gravity
Joseph Ntahompagaze, Amare Abebe, Manasse R. Mbonye
This work deals with the computation of the power spectrum of large-scale structure using the dynamical system approach for a multi-fluid universe in scalar-tensor theory of gravit…
Cosmological perturbations in f(G) gravity
Albert Munyeshyaka, Joseph Ntahompagaze, Tom Mutabazi
We explore cosmological perturbations in a modified Gauss-Bonnet f(G) gravity, using a 1+3 covariant formalism. In such a formalism, we define gradient variables to get perturbed l…
On multifluid perturbations in scalar-tensor cosmology
Joseph Ntahompagaze, Shambel Sahlu, Amare Abebe +1
In this paper the scalar-tensor theory is applied to the study of perturbations in a multi-fluid universe, using the 1+3 covariant approach. Both scalar and harmonic decompositions…
A study of perturbations in scalar-tensor theory using 1+3 covariant approach
Joseph Ntahompagaze, Amare Abebe, Manasse R. Mbonye
This work discusses scalar-tensor theories of gravity, with a focus on the Brans-Dicke subclass, and one that also takes note of the latter's equivalence with gravitation th…
On gravity in scalar-tensor theories
Joseph Ntahompagaze, Amare Abebe, Manasse Mbonye
We study gravity models in the language of scalar-tensor theories. The correspondence between gravity and scalar-tensor theories is revisited since gravity is…