# Back Reaction of Cosmological Perturbations

@article{Brandenberger2000BackRO, title={Back Reaction of Cosmological Perturbations}, author={Robert Brandenberger}, journal={arXiv: High Energy Physics - Theory}, year={2000}, pages={198-206} }

The presence of cosmological perturbations affects the background metric and matter configuration in which the perturbations propagate. This effect, studied a long time ago for gravitational waves, also is operational for scalar gravitational fluctuations, inhomogeneities which are believed to be more important in inflationary cosmology. The back-reaction of fluctuations can be described by an effective energy-momentum tensor. The issue of coordinate invariance makes the analysis more…

## 23 Citations

### Back Reaction of Cosmological Perturbations and the Cosmological Constant Problem

- Physics
- 2000

The presence of cosmological fluctuations influences the background cosmology in which the perturbations evolve. This back-reaction arises as a second order effect in the cosmological perturbation…

### Dynamical relaxation of the cosmological constant and matter creation in the Universe

- Physics
- 2004

In this paper we discuss the issues of the graceful exit from inflation and of matter creation in the context of a recent scenario in which the back-reaction of long-wavelength cosmological…

### Dynamical relaxation of the cosmological constant and matter creation in the Universe

- Physics
- 2004

In this paper we discuss the issues of the graceful exit from inflation and of matter creation in the context of a recent scenario in which the back-reaction of long-wavelength cosmological…

### Backreaction of super-Hubble cosmological perturbations beyond perturbation theory

- PhysicsPhysical Review D
- 2018

We discuss the effect of super-Hubble cosmological fluctuations on the locally measured Hubble expansion rate. We consider a large bare cosmological constant in the early Universe in the presence of…

### Back-reaction of cosmological perturbations in the infinite wavelength approximation

- Physics
- 2004

Cosmological perturbations in an expanding universe back-react on the space-time in which they propagate. Calculations to lowest non-vanishing order in perturbation theory indicate that…

### Back-reaction of perturbations in two scalar field inflationary models

- Physics
- 2003

We calculate the back-reaction of long wavelength cosmological perturbations on a general relativistic measure of the local expansion rate of the universe. Specifically, we consider a cosmological…

### Lectures on the theory of cosmological perturbations

- Physics
- 2003

The theory of cosmological perturbations has become a cornerstone of modern quantitative cosmology since it is the framework which provides the link between the models of the very early Universe such…

### Termination of the phase of quintessence by gravitational back reaction

- Physics
- 2001

We study the effects of gravitational back reaction in models of quintessence. The effective energy-momentum tensor with which cosmological fluctuations back react on the background metric will in…

### Back reaction and local cosmological expansion rate

- Physics
- 2002

We calculate the back reaction of cosmological perturbations on a general relativistic variable which measures the local expansion rate of the Universe. Specifically, we consider a cosmological model…

### Exact renormalization group flow in an expanding Universe and screening of the cosmological constant

- Physics
- 2013

We obtain the exact renormalization group (RG) flow equation for a self interacting real scalar field in an expanding cosmological background. The beta functional for the potential in the local…

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