Mathematics – Logic
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...20925601i&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #256.01; Bulletin of the American Astronomical Society,
Mathematics
Logic
Scientific paper
The acceleration of the expansion of the universe is one of the most important and challenging problems in physics. An important step in understanding this problem is to determine if the acceleration is due to: (1) a dark energy component in the universe or (2) a modification to gravity at cosmological scales. We report here some further results on a procedure that we proposed to distinguish between the two possible causes. We explore the fact that the effect of dark energy on the expansion history must be mathematically consistent with the effect of dark energy on the growth rate of large-scale structure. We use different pairs of simulated data of weak gravitational lensing, supernovae, and CMB, and are able to find inconsistencies when present. As an example, we apply the procedure to a universe described by a recently proposed 5-dimensional modified gravity model. We show that this leads to an inconsistency within the dark energy parameter space detectable by future experiments (The authors acknowledge the partial support of: NASA TA-NNG04GK55G; AST-0413793; NSF-GRF, and UTD-Clark award)
Ishak Mustapha B.
Spergel David N.
Upadhye Amol
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