Mathematics – Logic
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21715105d&link_type=abstract
American Astronomical Society, AAS Meeting #217, #151.05; Bulletin of the American Astronomical Society, Vol. 43, 2011
Mathematics
Logic
Scientific paper
Cosmic acceleration could be either an effect of dark energy or of a gravity theory other than General Relativity operating on cosmological scales. We constrain these competing possibilities by examining the growth of perturbations in both the Cosmic Microwave Background and large scale structure as measured by weak lensing surveys, galaxy counts, and galaxy-CMB cross-correlations. We consider a model-independent parametrization of departures from General Relativity and find that, while Newton's constant is constrained to be consistent with General Relativity to within a few 10%, a parameter modifying the growth rate of structure is largely unconstrained by present data. We do find evidence for departure from General Relativity at small scales and low redshifts. We believe, however, that this is due primarily to artifacts in the data and uncertainty in the behavior of non-General Relativity gravity theories at non-linear scales. This work was supported by the World Class University grant R32-2009-000-10130-0 through the National Research Foundation, Ministry of Education, Science and Technology of Korea.
Daniel Scott
Linder Eric V.
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