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  Apparent and average accelerations of the Universe

Bolejko, K., & Andersson, L. (2008). Apparent and average accelerations of the Universe. Journal of Cosmology and Astroparticle Physics, (10): 003. doi:10.1088/1475-7516/2008/10/003.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-0013-137D-B Version Permalink: https://hdl.handle.net/11858/00-001M-0000-0013-137F-7
Genre: Journal Article

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Bolejko, Krzysztof1, 2, Author
Andersson, Lars3, 4, Author
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1External Organizations, School of Physics, University of Melbourne, VIC 3010, Australia, ou_persistent22              
2External Organizations, Nicolaus Copernicus Astronomical Center, Bartycka 18, 00-716 Warsaw, Poland, ou_persistent22              
3Geometric Analysis and Gravitation, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, Golm, DE, ou_24012              
4External Organizations, Department of Mathematics, University of Miami, Coral Gables, FL 33124, USA, ou_persistent22              

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 Abstract: In this paper we consider the relation between the volume deceleration parameter obtained within the Buchert averaging scheme and the deceleration parameter derived from supernova observation. This work was motivated by recent findings that showed that there are models which despite having Λ = 0 have volume deceleration parameter qvol<0. This opens the possibility that back-reaction and averaging effects may be used as an interesting alternative explanation to the dark energy phenomenon. We have calculated qvol in some Lemaître–Tolman models. For those models which are chosen to be realistic and which fit the supernova data, we find that qvol>0, while those models which we have been able to find which exhibit qvol<0 turn out to be unrealistic. This indicates that care must be exercised in relating the deceleration parameter to observations.

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 Dates: 2008-10-03
 Publication Status: Published online
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 Rev. Type: Peer
 Identifiers: DOI: 10.1088/1475-7516/2008/10/003
eDoc: 398296
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Title: Journal of Cosmology and Astroparticle Physics
Source Genre: Journal
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Pages: - Volume / Issue: (10) Sequence Number: 003 Start / End Page: - Identifier: ISSN: 1475-7516