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dc.contributor.authorZuntz, J.en
dc.contributor.authorBaker, T.en
dc.contributor.authorFerreira, P. G.en
dc.contributor.authorSkordis, C.en
dc.creatorZuntz, J.en
dc.creatorBaker, T.en
dc.creatorFerreira, P. G.en
dc.creatorSkordis, C.en
dc.description.abstractThere are a number of approaches to testing General Relativity (GR) on linear scales using parameterized frameworks for modifying cosmological perturbation theory. It is sometimes assumed that the details of any given parameterization are unimportant if one uses it as a diagnostic for deviations from GR. In this brief report we argue that this is not necessarily so. First we show that adopting alternative combinations of modifications to the field equations significantly changes the constraints that one obtains. In addition, we show that using a parameterization with insufficient freedom significantly tightens the apparent theoretical constraints. Fundamentally we argue that it is almost never appropriate to consider modifications to the perturbed Einstein equations as being constraints on the effective gravitational constant, for example, in the same sense that solar system constraints are. The only consistent modifications are either those that grant near-total freedom, as in decomposition methods, or ones which map directly to a particular part of theory space. © 2012 IOP Publishing Ltd and Sissa Medialab srl.en
dc.sourceJournal of Cosmology and Astroparticle Physicsen
dc.subjectmodified gravityen
dc.subjectcosmological parameters from CMBRen
dc.subjectcosmological parameters from LSSen
dc.subjectintegrated Sachs-Wolfe effecten
dc.titleAmbiguous tests of general relativity on cosmological scalesen
dc.description.issue6Σχολή Θετικών και Εφαρμοσμένων Επιστημών / Faculty of Pure and Applied SciencesΤμήμα Φυσικής / Department of Physics
dc.description.notes<p>Cited By :21</p>en
dc.source.abbreviationJ.Cosmol.Astroparticle Phys.en
dc.contributor.orcidSkordis, C. [0000-0001-5873-4259]

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