Bayesian analysis of Friedmannless cosmologies
Øystein Elgarøy,Tuomas Multamäki +1 more
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In this paper, the authors calculate the Bayesian evidence of a range of different parameterizations of the deceleration parameter and show that although there is strong evidence in the data for an accelerating universe, there is little evidence that the parameter varies with redshift.Abstract:
Assuming only a homogeneous and isotropic universe and using both the 'Gold' Supernova Type Ia sample of Riess et al. and the results from the Supernova Legacy Survey, we calculate the Bayesian evidence of a range of different parameterizations of the deceleration parameter. We consider both spatially flat and curved models. Our results show that although there is strong evidence in the data for an accelerating universe, there is little evidence that the deceleration parameter varies with redshift.read more
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Backreaction in late-time cosmology
Thomas Buchert,Syksy Räsänen +1 more
TL;DR: In this paper, the effect of the formation of nonlinear structures on the expansion rate, spatial curvature and light propagation in the universe is reviewed, focusing on the possibility that it could explain cosmological observations without the introduction of dark energy or modified gravity.
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Cosmography: Extracting the Hubble series from the supernova data
Celine Cattoen,Matt Visser +1 more
TL;DR: In this paper, the authors performed a number of inter-related cosmographic fits to the legacy05 and gold06 supernova datasets and concluded that the case for an accelerating universe is considerably less watertight than commonly believed.
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Bayesian Evidence for a Cosmological Constant using new High-Redshift Supernovae Data
TL;DR: This article carried out a Bayesian model selection analysis of different dark energy parametrizations using the recent luminosity distance data of high redshift supernovae from Riess et al. 2007 and from the new ESSENCE Supernova Survey.
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Evaluating backreaction with the peak model of structure formation
TL;DR: In this paper, the average expansion rate of a universe which contains a realistic evolving ensemble of nonlinear structures is evaluated, and the authors use the peak model of structure formation to obtain the number density of structures and take the individual structures to be spherical.
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Light propagation in statistically homogeneous and isotropic universes with general matter content
Syksy Räsänen,Syksy Räsänen +1 more
TL;DR: In this article, the relationship of the redshift and the angular diameter distance to the average expansion rate for universes which are statistically homogeneous and isotropic and where the distribution evolves slowly, but which have otherwise arbitrary geometry and matter content was derived.