Digging up Large-Scale-Structure Information with Logs

Details Digging up Large-Scale-Structure Information with Logs Digging up Large-Scale-Structure Information with Logs

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21543705n&link_type=abstract

American Astronomical Society, AAS Meeting #215, #437.05; Bulletin of the American Astronomical Society, Vol. 42, p.390

Mathematics

Logic

Scientific paper

Applying a logarithmic mapping makes the power spectrum more suited to describe the (roughly lognormal) cosmological density field. A logarithmic mapping extends the effective linear regime of the power spectrum of the density field by a factor of several. The shape of the power spectrum becomes hardly different from the linear power spectrum to k 1 h/Mpc, and a factor of 10 more Fisher information is revealed on non-linear scales. We show these results, as well as give some insights about how the log mapping transfers information from Fourier phase correlations to amplitudes.

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