22-30 July 2021
North-West University
Africa/Johannesburg timezone
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Dark-fluid constraints of shear-free universes

27 Jul 2021, 16:00
Potchefstroom Campus (North-West University)

Potchefstroom Campus

North-West University

Oral Presentation Track D1 - Astrophysics Astrophysics


Dr Maye Elmardi (Center for Space Research, NWU)


We present the evolutionary constraints of shear-free cosmological solutions in the presence of a dark fluid. After describing the general evolution and constraint equations for quasi-Newtonian and anti-Newtonian spacetimes, we derive, at the level of linear perturbations, the conditions for the existence and consistent evolution of such spacetimes when they are endowed with the Chaplygin gas which mimics a unified description of dark matter and dark energy.

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Primary authors

Dr Maye Elmardi (Center for Space Research, NWU) Prof. Amare Abebe (Center for Space Research, NWU)

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