Mathematics – Logic
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21743205d&link_type=abstract
American Astronomical Society, AAS Meeting #217, #432.05; Bulletin of the American Astronomical Society, Vol. 43, 2011
Mathematics
Logic
Scientific paper
Recently, much attention has gone into detecting deviations from general relativity in the growth history of the universe by parameterizing both modifications to Poisson's equation, as well as the ratio between the two metric potentials in the perturbed FLRW metric. We compare some of the various parameterizations that that have been proposed in recent literature. Using current cosmological data including Type Ia supernovae data from the Supernova Cosmology Project's Union 2 compilation, baryon acoustic oscillations, CMB temperature and polarization spectra from WMAP 7, the SDSS DR7 matter power spectrum, Integrated Sachs Wolfe-galaxy cross-correlations with galaxies from the 2MASS and SDSS LRG surveys, and the latest HST COSMOS 3D weak lensing tomography, we place constraints on some of these parameters. Indeed, detecting a deviation from general relativity using these parameterizations would shed light on the question of whether the observed cosmic-acceleration is due to an as of yet unknown dark energy permeating the universe or a modification of general relativity at cosmological scales. Our results indicate that the values corresponding to General Relativity are consistent with all current data. Of course, this may change with future, higher precision data.
Dossett Jason
Ishak Mustapha
Moldenhauer Jacob
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