A rule of thumb for cosmological backreaction

Details A rule of thumb for cosmological backreaction A rule of thumb for cosmological backreaction

2006-05-05

arxiv.org/abs/astro-ph/0605159v2

JCAP 0606 (2006) 016

Astronomy and Astrophysics

Astrophysics

5 pages, references added, comment clarified in Introduction

Scientific paper

10.1088/1475-7516/2006/06/016

In the context of second order perturbation theory, cosmological backreaction is seen to rescale both time and the scale factor. The issue of the homogeneous limit of long-wavelength perturbations is addressed and backreaction is quantified in terms of a gauge-invariant metric function that is the true physical degree of freedom in the homogeneous limit. The time integral of this metric function controls whether backreaction hastens or delays the expansion of the universe. As an example, late-time acceleration of the universe is shown to be inconsistent with a perturbative approach. Any tendency to accelerate the expansion requires negative non-adiabatic pressure fluctuations.

Affiliated with

Also associated with

No associations

Rating

A rule of thumb for cosmological backreaction does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with A rule of thumb for cosmological backreaction, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A rule of thumb for cosmological backreaction will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-608289