The authors derive the Friedmann equations and their first-order perturbations from Newtonian mechanics and thermodynamics, and show the perturbed equations coincide with general relativity at linear order.
On the Possibility of a world with constant negative curvature of space,
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On the perturbed Friedmann equations in Newtonian Gauge
The authors derive the Friedmann equations and their first-order perturbations from Newtonian mechanics and thermodynamics, and show the perturbed equations coincide with general relativity at linear order.