A discriminating probe of gravity at cosmological scales

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dc.creatorZhang, Pengjie
dc.creatorLiguori, Michele
dc.creatorBean, Rachel
dc.creatorDodelson, Scott
dc.date2007-04-16
dc.date2007-11-28
dc.date.accessioned2026-07-07T11:56:36Z
dc.date.available2026-07-07T11:56:36Z
dc.descriptionThe standard cosmological model is based on general relativity and includes dark matter and dark energy. An important prediction of this model is a fixed relationship between the gravitational potentials responsible for gravitational lensing and the matter overdensity. Alternative theories of gravity often make different predictions for this relationship. We propose a set of measurements which can test the lensing/matter relationship, thereby distinguishing between dark energy/matter models and models in which gravity differs from general relativity. Planned optical, infrared and radio galaxy and lensing surveys will be able to measure $E_G$, an observational quantity whose expectation value is equal to the ratio of the Laplacian of the Newtonian potentials to the peculiar velocity divergence, to percent accuracy. We show that this will easily separate alternatives such as $Λ$CDM, DGP, TeVeS and $f(R)$ gravity.
dc.descriptionv2: minor revisions in the main text, fig, table and references. Slightly longer than the PRL version in press. V3: update the figure (minor change due to a coding bug. No other changes
dc.identifierhttps://arxiv.org/abs/0704.1932
dc.identifierhttp://arxiv.org/abs/0704.1932
dc.identifierPhys.Rev.Lett.99:141302,2007
dc.identifierdoi:10.1103/PhysRevLett.99.141302
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/205592
dc.subjectAstrophysics
dc.titleA discriminating probe of gravity at cosmological scales
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