Regular Article – Theoretical Physics
A new symmetry of the spatially flat Einstein–Friedmann equations
Department of Physics and Astronomy, Bishop’s University, 2600 College Street, J1M 1Z7, Sherbrooke, Québec, Canada
Accepted: 20 October 2020
Published online: 30 October 2020
We report a new symmetry of the Einstein–Friedmann equations for spatially flat Friedmann- Lemaître-Robertson-Walker universes. We discuss its application to barotropic perfect fluids and its use as a solution-generating technique for scalar field universes.
© The Author(s) 2020
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