Is there proof that backreaction of inhomogeneities is irrelevant in cosmology?

Show simple item record Buchert, T. Carfora, M. Ellis, G. F. R. Kolb, E. W. MacCallum, M. A. H. Ostrowski, J. J. Räsänen, S. Roukema, B. F. Andersson, L. Coley, A. A. Wiltshire, D. L. 2020-01-22T14:11:01Z 2020-01-22T14:11:01Z 2015-11-05
dc.identifier.citation Buchert , T , Carfora , M , Ellis , G F R , Kolb , E W , MacCallum , M A H , Ostrowski , J J , Räsänen , S , Roukema , B F , Andersson , L , Coley , A A & Wiltshire , D L 2015 , ' Is there proof that backreaction of inhomogeneities is irrelevant in cosmology? ' , Classical and Quantum Gravity , vol. 32 , no. 21 , 215021 .
dc.identifier.other PURE: 57071127
dc.identifier.other PURE UUID: 9215eb4a-48b4-4ba6-a0c4-a9d39bbebf6c
dc.identifier.other WOS: 000364921200024
dc.identifier.other Scopus: 84945161540
dc.identifier.other ORCID: /0000-0003-2296-302X/work/29471558
dc.description.abstract No. In a number of papers, Green and Wald argue that the standard FLRW model approximates our Universe extremely well on all scales, except close to strong-field astrophysical objects. In particular, they argue that the effect of inhomogeneities on average properties of the Universe (backreaction) is irrelevant. We show that this latter claim is not valid. Specifically, we demonstrate, referring to their recent review paper, that (i) their two-dimensional example used to illustrate the fitting problem differs from the actual problem in important respects, and it assumes what is to be proven; (ii) the proof of the trace-free property of backreaction is unphysical and the theorem about it fails to be a mathematically general statement; (iii) the scheme that underlies the trace-free theorem does not involve averaging and therefore does not capture crucial non-local effects; (iv) their arguments are to a large extent coordinate-dependent, and (v) many of their criticisms of backreaction frameworks do not apply to the published definitions of these frameworks. It is therefore incorrect to infer that Green and Wald have proven a general result that addresses the essential physical questions of backreaction in cosmology. en
dc.format.extent 38
dc.language.iso eng
dc.relation.ispartof Classical and Quantum Gravity
dc.rights other
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject relativistic cosmology
dc.subject inhomogeneity effects
dc.subject weak-limits
dc.subject DARK ENERGY
dc.subject UNIVERSE
dc.subject DYNAMICS
dc.subject TENSOR
dc.subject 115 Astronomy, Space science
dc.title Is there proof that backreaction of inhomogeneities is irrelevant in cosmology? en
dc.type Article
dc.contributor.organization Department of Physics
dc.contributor.organization Helsinki Institute of Physics
dc.description.reviewstatus Peer reviewed
dc.relation.issn 0264-9381
dc.rights.accesslevel openAccess
dc.type.version acceptedVersion

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