Spatial Curvature and Cosmological Tests of General Relativity

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dc.contributor.ISNI0000 0001 2874 3832 (Ishak-Boushaki, M)
dc.contributor.authorIshak-Boushaki, Mustaphaen_US
dc.contributor.authorDossett, Jason N.en_US
dc.contributor.utdAuthorIshak-Boushaki, Mustaphaen_US
dc.contributor.utdAuthorDossett, Jason N.en_US
dc.date.accessioned2013-01-15T17:16:21Z
dc.date.available2013-01-15T17:16:21Z
dc.date.created2012-02-15en_US
dc.date.issued2012-03-23en_US
dc.descriptionen_US
dc.description.abstractIt is well-known that allowing for spatial curvature affects constraints on cosmological parameters such as the dark energy equation of state parameters. Here we study the effect of curvature on constraints on parameters used to test general relativity (GR) at cosmological scales, commonly known as modified growth (MG) parameters. While current data taken in the context of the ΛCDM model points to a universe that is spatially flat, this constraint does not necessarily hold in modified gravity theories or even in relativistic inhomogeneous cosmological models. Using the latest cosmological data sets we find that MG parameters are correlated with the curvature parameter Ω_k and the constraints on the MG parameters are weakened compared to when Ω_k is not included in the parameter analysis. We next use various future simulated data sets, including cosmic microwave background, weak lensing, and Integrated Sachs-Wolfegalaxy cross-correlations, where the fiducial model is spatially curved but we assume a flat model when fitting the MG parameters. We find the assumption of a spatially flat model on a spatially curved universe does indeed cause an artificial shift in the constraints on the MG parameters, in some cases even producing an apparent deviation from GR in the MG parameter space. For our simulated data, tension with GR begins to manifest itself for fiducial models with |Ω k| ≥ 0:02 and apparent deviations appear for |Ω_k| ≥ 0:05. We find that for negatively curved models the apparent deviation is more significant. The manifestation of this apparent deviation from GR due to the assumption of spatial flatness above leads one to conclude that, when using future high-precision data to perform these tests, spatial curvature must be included in the parameter analysis along with the other core cosmological parameters and the MG parameters.en_US
dc.description.versionFinal published versionen_US
dc.identifier.bibliographicCitationDossett, Jason, and Mustapha Ishak. “Spatial Curvature and Cosmological Tests of General Relativity 2012.”Physical Review D." 86(10), doi:10.1103/PhysRevD.86.103008.en_US
dc.identifier.urihttp://hdl.handle.net/10735.1/2495
dc.publisherAmerican Physical Societyen_US
dc.relation.urihttp://dx.doi.org/10.103/PhysRevD.86.103008
dc.rights©2012 American Physical Societyen_US
dc.sourcePhysical Review D
dc.subjectGeneral relativity (Physics)en_US
dc.subjectCurvature cosmology.en_US
dc.titleSpatial Curvature and Cosmological Tests of General Relativityen_US
dc.typeTexten_US
dc.type.genreArticleen_US

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