= Newtonian gauge
{wiki=Newtonian_gauge}
The Newtonian gauge is a specific choice of gauge used in the study of cosmological perturbations in the context of General Relativity. It is particularly useful in cosmology for analyzing the evolution of perturbations in the spacetime geometry during the universe's expansion. In the Newtonian gauge, the perturbed metric is expressed in a way that simplifies the analysis of scalar perturbations, which are fluctuations in the energy density of the universe, such as those arising from gravitational waves or inflationary fluctuations.
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