Mathematics – Logic
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21533703z&link_type=abstract
American Astronomical Society, AAS Meeting #215, #337.03; Bulletin of the American Astronomical Society, Vol. 42, p.441
Mathematics
Logic
Scientific paper
General relativistic corrections to the expansion rate of the universe arise when the Einstein equations are averaged over a spatial volume in a locally inhomogeneous cosmology. It has been suggested that they may contribute to the observed cosmic acceleration. In this talk, we propose a new scheme that enables us to use N-body simulations to make a realistic estimate of the magnitude of these corrections for general inhomogeneities in (3+1) spacetime. We then quantitatively calculate the volume averaged modified expansion rate using the N-body simulation code Gadget2 and compare it with the expansion rate in a standard FRW cosmology. We will also discuss its possible impacts on the cosmological observables. This work is partially supported by DOE grant DE-FG02-95-ER40934.
Mathews Geoffrey
Zhao Xinghai
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