17 citations · 57 across the 15 of their papers we have counts for
15 papers · 1 filter
Cosmic Hysteresis in Reconstructed Bounce Models A Torsion-Based Thermodynamic Perspective
Aritra Sanyal, Praveen Kumar Dhankar, Albert Munyeshyaka +3
We investigate the emergence of cosmic hysteresis in cyclic and bouncing cosmologies within the framework of reconstructed gravity. In contrast to curvature-based modificati…
Constraints on multi-fluid cosmology in modified Gauss-Bonnet gravity models with different observational data sets
Praveen Kumar Dhankar, Albert Munyeshyaka, Aritra Sanyal +2
In the present work, we incorporate redshift-space distortion measurement to investigate the growth of large scale structure within the framework of multi-fluid cosmology in the co…
Cosmic Hysteresis in Reconstructed Bounce Models: A Thermodynamic Study
Aritra Sanyal, Praveen Kumar Dhankar, Albert Munyeshyaka +2
We study the emergence of cosmic hysteresis in cyclic bouncing universes within the framework of analytically reconstructed gravity. Using exact bouncing scale factor soluti…
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…
Large scale structure constraints and matter power spectrum in gravity
Praveen Kumar Dhankar, Albert Munyeshyaka, Saddam Hussain +1
In the present work, we take into account the dynamical system analysis to investigate the matter power spectrum within the framework of the gravitational th…
Observational analysis of bulk viscous modified Chaplygin gas in (2+1)-dimensional universe using MCMC
Praveen Kumar Dhankar, Aritra Sanyal, Albert Munyeshyaka +2
This paper investigates regarding cosmological implications of a bulk viscous modified Chaplygin gas (MCG) in (2+1)-dimensional Friedmann-Robertson-Walker spacetime, incorporating…
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 covariant perturbations with scalar field in modified Gauss-Bonnet gravity
Albert Munyeshyaka, Joseph Ntahompagaze, Tom Mutabazi +1
We investigate cosmological perturbations of f(G) gravity in the presence of a scalar field. Using the 1 + 3 covariant formalism, we present the energy overdensity perturbation equ…
On Chaplygin models in f(G) gravity
Fidele Twagirayezu, Abraham Ayirwanda, Albert Munyeshyaka +3
The current work treats cosmological perturbation in a mixture of standard matter, Chaplygin gas as well as Gauss-bonnet fluids using a 1+3 covariant approach in the context of mod…
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…
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…
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…