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A Symmetry of the Einstein–Friedmann Equations for Spatially Flat, Perfect Fluid, Universes

Department of Physics & Astronomy, Bishop’s University, Sherbrooke, QC J1M 1Z7, Canada
Symmetry 2020, 12(1), 147; https://doi.org/10.3390/sym12010147
Received: 18 December 2019 / Accepted: 4 January 2020 / Published: 10 January 2020
(This article belongs to the Special Issue Symmetry with Gravity and Particle Theories)
We report a symmetry property of the Einstein–Friedmann equations for spatially flat Friedmann–Lemaître–Robertson–Walker universes filled with a perfect fluid with any constant equation of state. The symmetry transformations form a one-parameter Abelian group. View Full-Text
Keywords: Einstein–Friedmann equations; cosmology; classical general relativity Einstein–Friedmann equations; cosmology; classical general relativity
MDPI and ACS Style

Faraoni, V. A Symmetry of the Einstein–Friedmann Equations for Spatially Flat, Perfect Fluid, Universes. Symmetry 2020, 12, 147.

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