Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-11-30
Phys.Rev.D75:043509,2007
Astronomy and Astrophysics
Astrophysics
10 pages, 5 figures, Added some notation clarifications and references, Accepted for publication as a Regular Article in Physi
Scientific paper
10.1103/PhysRevD.75.043509
We show that positive averaged acceleration obtained in LTB models through spatial averaging can require integration over a region beyond the event horizon of the central observer. We provide an example of a LTB model with positive averaged acceleration in which the luminosity distance does not contain information about the entire spatially averaged region, making the averaged acceleration unobservable. Since the cosmic acceleration is obtained from fitting the observed luminosity distance to a FRW model we conclude that in general a positive averaged acceleration in LTB models does not imply a positive FRW cosmic acceleration.
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