The separate universe and the back reaction of long wavelength fluctuations
arXiv:gr-qc/0503111 · doi:10.1103/PhysRevD.71.084016
Abstract
We investigate the backreaction of cosmological long wavelength perturbations on the evolution of the Universe. By applying the renormalization group method to a Friedmann-Robertson-Walker universe with long wavelength fluctuations, we demonstrate that the renormalized solution with the backreaction effect is equivalent to that of the separate universe. Then, using the effective Friedmann equation, we show that only non-adiabatic mode of long wavelength fluctuations affects the expansion law of the spatially averaged universe.
10 pages. to be published in Phys. Rev. D
Cited by in corpus (6)
- Can the Acceleration of Our Universe Be Explained by the Effects of Inhomogeneities?
- Constraints on backreaction in dust universes
- A rule of thumb for cosmological backreaction
- Evolution of Non-linear Fluctuations in Preheating after Inflation
- Hamiltonian formalism for cosmological perturbations: fixing the gauge
- Separate universe in multifield inflation: a phase-space approach