Unification of dark matter and dark energy: the inhomogeneous Chaplygin gas -
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For general relativistic spacetimes filled with irrotational 'dust'a generalized form of
Friedmann's equations for an 'effective'expansion factor a D of inhomogeneous cosmologies …

We consider the evolution of relativistic perturbations in the Einstein–de Sitter cosmological
model, including second-order effects. The perturbations are considered in two different …

The effective evolution of an inhomogeneous universe model in any theory of gravitation
may be described in terms of spatially averaged variables. In Einstein's theory, restricting …

No. In a number of papers, Green and Wald argue that the standard FLRW model
approximates our Universe extremely well on all scales, except close to strong-field …

We elaborate on the proposal that the observed acceleration of the Universe is the result of
the backreaction of cosmological perturbations, rather than the effect of a negative-pressure …

We consider the instability of the Friedmann world model to second order in perturbations.
We present the perturbed set of equations up to second order in the Friedmann background …

The Newtonian Lagrangian perturbation theory is a widely used framework to study structure
formation in cosmology in the nonlinear regime. We review a general-relativistic formulation …

The “Newtonian” theory of spatially unbounded, self-gravitating, pressureless continua in
Lagrangian form is reconsidered. Following a review of the pertinent kinematics, we present …

We perform three-dimensional numerical relativity simulations of homogeneous and
inhomogeneous expanding spacetimes, with a view toward quantifying nonlinear effects …