Inhomogeneity implies Accelerated Expansion

Abstract

The Einstein equations for an inhomogeneous irrotational dust universe are analysed. A set of mild assumptions, all of which are shared by the standard FLRW 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, then there is a period of accelerated expansion after cluster formation, even in the absence of a cosmological constant.

v2: 5 pages (lower number because of different formatting), 1 reference and several clarifying remarks added; v3: version accepted by PRD, slightly expanded by further remarks and a brief comparison with quasi-isotropic expansion

References in corpus (3)

• Does the growth of structure affect our dynamical models of the universe? The averaging, backreaction and fitting problems in cosmology
• Accelerated expansion from structure formation
• On the onset of cosmological backreaction

Cited by in corpus (10)

• Constraining cosmic curvature by using age of galaxies and gravitational lenses
• Measurement of marked correlation functions in SDSS-III Baryon Oscillation Spectroscopic Survey using LOWZ galaxies in Data Release 12
• On the covariance of scalar averaging and backreaction in relativistic inhomogeneous cosmology
• Light propagation in the averaged universe
• Cosmic bulk viscosity through backreaction
• Future evolution in a backreaction model and the analogous scalar field cosmology
• Future deceleration due to backreaction in a Universe with multiple inhomogeneous domains
• Analyzing the 21-cm signal brightness temperature in the Universe with inhomogeneities
• Constraining the Hubble parameter with the 21 cm brightness temperature signal in a universe with inhomogeneities
• The Evolution of an Inhomogeneous Universe