# 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…

### 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…

### 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…

### Principles, Progress and Problems in Inflationary Cosmology

- Physics
- 2002

Inflationary cosmology has become one of the cornerstones of modern cosmology. Inflation was the first theory within which it was possible to make predictions about the structure of the Universe on…

### Frontiers of Inflationary Cosmology

- Physics
- 2001

After a brief review the theory of cosmological perturbations, I highlight some recent progress in the area of reheating in inflationary cosmology, focusing in particular on parametric amplification…

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