299 citations · 966 across the 66 of their papers we have counts for
8 papers · 1 filter
Perturbations of quasi-Newtonian universes in scalar-tensor gravity
Heba Sami, Amare Abebe
In this contribution, we consider the equivalence between gravity and scalar-tensor theories to study the evolution of scalar cosmological perturbations in the covar…
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…
The Rényi holographic dark energy model in Chern-Simons gravity: some cosmological implications
Sarfraz Ali, Sarfaraz Khan, Sadia Sattar +1
In this paper, we study Rényi holographic dark energy model in the context of Chern Simons (CS) modified gravity theory. Different cosmological parameters such as energy density, d…
Perturbations in a Chaplygin gas Cosmology
Shambel Sahlu, Heba Sami, Anna-Mia Swart +3
In this paper we study the perturbations of a cosmic multi-fluid medium consisting of radiation, dust and a Chaplygin gas. To do so, we follow the 1 + 3 covariant formalism and der…
Schwarzschild black hole surrounded by quintessential matter field as an accelerator for spinning particles
Pankaj Sheoran, Hemwati Nandan, Eva Hackmann +2
We study the collision of two massive particles with non-zero intrinsic spin moving in the equatorial plane in the background of a Schwarzschild black hole surrounded by quintessen…
Accelerating universe in modified teleparallel gravity theory
Shambel Sahlu, Joseph Ntahompagaze, Amare Abebe +1
This paper studies the cosmology of accelerating expansion of the universe in modified teleparallel gravity theory. We discuss the cosmology of gravity theory and its impl…