A new formalism is derived for linear perturbations around an averaged cosmological background that treats backreaction effects as an effective perfect fluid, with applications showing impacts on structure growth in observationally fitted models.
Peebles,The Gravitational Instability of the Universe,Astrophys
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Cosmological perturbations on an averaged background
A new formalism is derived for linear perturbations around an averaged cosmological background that treats backreaction effects as an effective perfect fluid, with applications showing impacts on structure growth in observationally fitted models.