# Inhomogeneity implies accelerated expansion

@article{Skarke2014InhomogeneityIA, title={Inhomogeneity implies accelerated expansion}, author={Harald Skarke}, journal={Physical Review D}, year={2014}, volume={89}, pages={043506} }

The Einstein equations for an inhomogeneous irrotational dust universe are analyzed. A set of mild assumptions, all of which are shared by the standard Friedmann-Lemaitre-Robertson-Walker\char21{}type scenarios, results in a model that depends only on the distribution of scalar spatial curvature. If the shape of this distribution is made to fit the structure of the present Universe, with most of the matter in galaxy clusters and very little in the voids that will eventually dominate the volume…

## 9 Citations

### Evolution of an inhomogeneous universe

- Physics
- 2014

A refined version of a recently introduced method for analysing the dynamics of an inhomogeneous irrotational dust universe is presented. A fully non-perturbative numerical computation of the time…

### Cosmic acceleration as an optical illusion

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- 2015

We consider light propagation in an inhomogeneous irrotational dust universe with vanishing cosmological constant, with initial conditions as in standard linear perturbation theory. A…

### Light propagation in the averaged universe

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- 2014

Cosmic structures determine how light propagates through the Universe and consequently must be taken into account in the interpretation of observations. In the standard cosmological model at the…

### Future evolution in a backreaction model and the analogous scalar field cosmology

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- 2017

We investigate the future evolution of the universe using the Buchert framework for averaged backreaction in the context of a two-domain partition of the universe. We show that this approach allows…

### Cosmic bulk viscosity through backreaction

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- 2016

We consider an effective viscous pressure as the result of a backreaction of inhomogeneities within Buchert’s formalism. The use of an effective metric with a time-dependent curvature radius allows…

### Light in the inhomogeneous Universe: studies on light propagation in the averaged space-time

- Physics
- 2016

In standard cosmology a background geometry is used to interpret observations of the large scale structure of the Universe. The background means a homogeneous, isotropic and flat Friedmann-Lemaitre…

### Constraining cosmic curvature by using age of galaxies and gravitational lenses

- Physics
- 2016

We use two model-independent methods to constrain the curvature of the universe. In the first method, we study the evolution of the curvature parameter (Ωk0) with redshift by using the observations…

### On the covariance of scalar averaging and backreaction in relativistic inhomogeneous cosmology

- PhysicsClassical and Quantum Gravity
- 2019

We introduce a generalization of the 4-dimensional averaging window function of Gasperini et al (2010 J. Cosmol. Astropart. Phys. JCAP02(2010)009) that may prove useful for a number of applications.…

### Measurement of marked correlation functions in SDSS-III Baryon Oscillation Spectroscopic Survey using LOWZ galaxies in Data Release 12

- PhysicsMonthly Notices of the Royal Astronomical Society
- 2019

Marked correlation functions, which are sensitive to the clustering of galaxies in different environments, have been proposed as constraints on modified gravity models. We present measurements of the…

## References

SHOWING 1-10 OF 15 REFERENCES

### On Average Properties of Inhomogeneous Fluids in General Relativity: Dust Cosmologies

- Physics
- 1999

For general relativistic spacetimes filled with irrotational ‘dust’ a generalized form of Friedmann's equations for an ‘effective’ expansion factor aD of inhomogeneous cosmologies is derived.…

### Accelerated expansion from structure formation

- Physics, Geology
- 2006

We discuss the physics of backreaction-driven accelerated expansion. Using the exact equations for the behaviour of averages in dust universes, we explain how large-scale smoothness does not imply…

### On cosmic acceleration without dark energy

- Physics
- 2006

We elaborate on the proposal that the observed acceleration of the Universe is the result of the backreaction of cosmological perturbations, rather than the effect of a negative-pressure dark-energy…

### Onset of cosmological backreaction

- Physics
- 2007

Cosmological backreaction has been suggested as an explanation of dark energy and is heavily disputed since. We combine cosmological perturbation theory with Buchert's nonperturbative framework,…

### Comment about quasi-isotropic solution of Einstein equations near the cosmological singularity

- Physics, Mathematics
- 2002

For the case of arbitrary hydrodynamical matter, we generalize the quasi-isotropic solution of Einstein equations near the cosmological singularity, found by Lifshitz and Khalatnikov in 1960 for the…

### Does the growth of structure affect our dynamical models of the Universe? The averaging, backreaction, and fitting problems in cosmology

- Physics
- 2011

Structure occurs over a vast range of scales in the Universe. Our large-scale cosmological models are coarse-grained representations of what exists, which have much less structure than there really…

### Dark Energy from structure: a status report

- Physics
- 2007

The effective evolution of an inhomogeneous universe model in any theory of gravitation may be described in terms of spatially averaged variables. In Einstein’s theory, restricting attention to…

### The Cosmic Baryon Budget

- Physics
- 1997

We present an estimate of the global budget of baryons in all states, with conservative estimates of the uncertainties, based on all relevant information we have been able to marshal. Most of the…

### Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant

- Physics
- 1998

We present spectral and photometric observations of 10 Type Ia supernovae (SNe Ia) in the redshift range 0.16 ≤ z ≤ 0.62. The luminosity distances of these objects are determined by methods that…