PIRSA:08090001 Scientific Series Cosmology

DOI10.48660/08090001

Series: Cosmology and Gravitation

Brown, I. (2008). Averaging Robertson-Walker Cosmologies. Perimeter Institute. https://pirsa.org/08090001

Brown, Iain. Averaging Robertson-Walker Cosmologies. Perimeter Institute, Sep. 09, 2008, https://pirsa.org/08090001 

@misc{ pirsa_PIRSA:08090001,
  doi = {10.48660/08090001},
  url = {https://pirsa.org/08090001},
  author = {Brown, Iain},
  keywords = {Cosmology},
  language = {en},
  title = {Averaging Robertson-Walker Cosmologies},
  publisher = {Perimeter Institute},
  year = {2008},
  month = {sep},
  note = {PIRSA:08090001 see, \url{https://pirsa.org}}
}

Abstract

The so-called cosmological backreaction arises when one directly averages the Einstein equations to recover cosmology. While usually applied to avoid employing dark energy models, strictly speaking any cosmological model should be built from such an averaging procedure rather than an assumed background. We apply the Buchert formalism to Einstein-de Sitter, Lambda CDM and quintessence cosmologies, and as a first approach to the full problem, evaluate numerically the discrepancies arising from linear perturbation theory between the averaged behaviour and the assumed behaviour. (References: J. Behrend, IB and G. Robbers, JCAP01(2008)013, aXiv:0710.4964; IB, G. Robbers and J. Behrend, in preperation)

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