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- W2110354911 abstract "We develop a new formalism for the treatment of gravitational backreaction in the cosmological setting. The approach is inspired by projective tec hniques in non-equilibrium statistical mechanics. We employ group-averaging with respect to the action of the isotropy group of homogeneous and isotropic spacetimes (rather than spatial averaging), in order to define effective FRW variables for a generic spacetime. Using the Hamiltonian formalism for gravitating perfect fluids, we obtain a set of equations for the evolution of the effective variables; these equations incorporate the effects of backreaction by the inhomogeneities. Specializing to dust-filled spacetimes, we find regimes that lead to a closed set of backreaction equat ions, which we solve for small inhomogeneities. We then study the case of large inhomogeneities in relation to the proposal that backreaction can lead to accelerated expansion. In particular, we identify regions of the gravitational state space that correspond to effective cosmic a cceleration. Necessary conditions are (i) a strong expansion of the congruences corresponding to comoving observers, and (ii) a large negative value of a dissipation variable that appears in the effective equations (i.e, an effective ”anti-dissipation”)." @default.
- W2110354911 created "2016-06-24" @default.
- W2110354911 creator A5037109902 @default.
- W2110354911 date "2009-04-21" @default.
- W2110354911 modified "2023-09-23" @default.
- W2110354911 title "Gravitational backreaction in cosmological spacetimes" @default.
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- W2110354911 doi "https://doi.org/10.1103/physrevd.79.084029" @default.
- W2110354911 hasPublicationYear "2009" @default.
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