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gr-qc2020★ 4 cited
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…
gr-qc2020
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…