output
20142025
most citedIncremental Fermi Large Area Telescope Fourth Source Catalog

583 citations

researchers with a paper here

Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.

collaborating institutions
Showing gr-qcShow all

8 papers · 1 filter

gr-qc2021

Covariant density and velocity perturbations of the quasi-Newtonian cosmological model in gravity

Heba Sami, Shambel Sahlu, Amare Abebe +1

We investigate classes of shear-free cosmological dust models with irrotational fluid flows within the framework of gravity. In particular, we use the covariant form…

gr-qc2020★ 15 cited

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…

gr-qc2020★ 5 cited

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…

gr-qc2019★ 37 cited

Scalar perturbations in gravity using the covariant approach

Shambel Sahlu, Joseph Ntahompagaze, Amare Abebe +2

The cosmological scalar perturbations of standard matter are investigated in the context of extended teleparallel gravity theories using the covariant formalism. After…

gr-qc2019★ 20 cited

The Chaplygin gas as a model for modified teleparallel gravity?

Shambel Sahlu, Joseph Ntahompagaze, Maye Elmardi +1

This paper explores the possibility of treating the exotic Chaplygin-gas (CG) fluid model as some manifestation of an gravitation. To this end, we use the different cosmolog…

gr-qc2018★ 16 cited

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…

gr-qc2017★ 34 cited

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…

gr-qc2014★ 18 cited

Breaking the cosmological background degeneracy by two-fluid perturbations in f(R) gravity

Amare Abebe

One of the exact solutions of f(R) theories of gravity in the presence of different forms of matter exactly mimics the LCDM solution of general relativity at the background level.…