Chapitres
du Cours
- Brief
overview of the observations
- The
effect of inhomogeneity/anisotropy on
the expansion rate
- Understanding
acceleration due to structure
formation physically
- Evaluating
the magnitude of the effect of
structure formation on the
expansion rate
- Conclusions
-
Résumé
Observations
of the late-time universe are inconsistent with homogeneous and
isotropic models of the universe with ordinary matter and
gravity. This is usually interpreted as evidence of an exotic matter
component or modified gravity. However, the formation of non-linear
structures affects the expansion of the universe, and it has a
preferred timescale near the observed acceleration era. I will review
the possibility that structure formation could explain the observations
without any new physics.
Bibliographie
- Ellis
G F R, "Relativistic cosmology: its nature, aims and problems", 1984,
in: "The invited papers of the 10th international conference on general
relativity and gravitation", p 215
- Ellis G F R and Stoeger W, "The 'fitting
problem' in cosmology", 1987, Class. Quant. Grav 4, 1697
- Buchert T and Ehlers J, "Averaging
inhomogeneous cosmologies", astro-ph/9510056
- Buchert T, "On average properties of
inhomogeneous fluids in general relativity I: dust cosmologies",
gr-qc/9906015
- Rasanen S, "Accelerated expansion from
structure formation", astro-ph/0607626 (There is a concise 6-page
version with the main details: astro-ph/0605632.)
- Rasanen S, "Evaluating backreaction with the
peak model of structure formation", arXiv:0801.2692 (There is a concise
6-page version with the main details: arXiv:0805.2670.)
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