Mathematics – Logic
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008mgm..conf.1659b&link_type=abstract
"THE ELEVENTH MARCEL GROSSMANN MEETING On Recent Developments in Theoretical and Experimental General Relativity, Gravitation an
Mathematics
Logic
Scientific paper
The kinetic properties of dark cosmological sectors are imprinted on the CMB through the gravitational impact of the dark sectors' perturbations. The impact occurs primarily during horizon entry, when general relativity is essential. By using a formalism which is technically simpler than traditional ones and in which the gravitational forcing of large-scale perturbations is concurrent with the responsible local dynamics of dark species, we can alleviate gauge artifacts and map the observable characteristics of CMB fluctuations to the properties of dark species which affect them. As an example, we show that the order-of-magnitude enhancement of the CMB power above ℓ ~ 100 is entirely due to the gravitational suppression of the CMB modes at the lower ℓ's by matter inhomogeneities; the frequently invoked resonant "radiation driving" at ℓ ≳ 100 is a gauge artifact. Consequently, this feature strongly constrains dark dynamics and laws of gravity during the matter but not radiation era.
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