First direct constraints on total cosmic backreaction over a significant redshift range are consistent with vanishing backreaction within 1 sigma but are too weak to exclude meaningful backreaction.
R¨ as¨ anen, JCAP02, 011 (2009), arXiv:0812.2872 [astro-ph]
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A new null test is proposed to isolate cosmologies with non-FLRW observational relations by characterizing how they violate curvature-consistency tests of the standard FLRW framework.
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First observational constraints on cosmic backreaction over an extended redshift range
First direct constraints on total cosmic backreaction over a significant redshift range are consistent with vanishing backreaction within 1 sigma but are too weak to exclude meaningful backreaction.
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Observational Tests for Distinguishing Classes of Cosmological Models
A new null test is proposed to isolate cosmologies with non-FLRW observational relations by characterizing how they violate curvature-consistency tests of the standard FLRW framework.