Structure formation as an alternative to dark energy and modified gravity

Abstract

Observations are inconsistent with a homogeneous and isotropic universe with ordinary matter and gravity. The universe is far from exact homogeneity and isotropy at late times, and the effect of the non-linear structures has to be quantified before concluding that new physics is needed. We explain how structure formation can lead to accelerated expansion, and discuss a semi-realistic model where the timescale of the change in the expansion rate emerges from the physics of structure formation.

12 pages, 4 figures, contribution to the proceedings of the July 2008 CRAL-IPNL conference "Dark Energy and Dark Matter"

References in corpus (8)

• A hierarchy of voids: Much ado about nothing
• Cosmic homogeneity demonstrated with luminous red galaxies
• Fluctuations of the luminosity distance
• Accelerated expansion from structure formation
• Can inhomogeneties accelerate the cosmic volume expansion?
• The Possibility of Cosmic Acceleration via Spatial Averaging in Lemaitre-Tolman-Bondi Models
• Evaluating backreaction with the peak model of structure formation
• Inhomogeneity-Induced Cosmic Acceleration in a Dust Universe

Cited by in corpus (7)

• General Relativity and Cosmology: Unsolved Questions and Future Directions
• Constraining the Asymptotically Safe Cosmology: cosmic acceleration without dark energy
• Redshift drift in an inhomogeneous universe: averaging and the backreaction conjecture
• Violation of the FRW consistency condition as a signature of backreaction
• A solution of the dark energy and its coincidence problem based on local antigravity sources without fine-tuning or new scales
• Constraining the swiss-cheese IR-fixed point cosmology with cosmic expansion
• Persistence in black hole lattice cosmological models