The Log-Density as a Better Cosmological Density Variable

Details The Log-Density as a Better Cosmological Density Variable The Log-Density as a Better Cosmological Density Variable

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21823304n&link_type=abstract

American Astronomical Society, AAS Meeting #218, #233.04; Bulletin of the American Astronomical Society, Vol. 43, 2011

Mathematics

Logic

Scientific paper

We discuss a few ways in which the log-density A is superior to the conventional overdensity in characterizing the large-scale structure of the Universe. A has a power spectrum with much smaller nonlinearities in both its shape and covariance. Thus it gives tighter constraints on many cosmological parameters. A is also more useful in estimating the displacement field in Lagrangian reconstruction methods.

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