Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 698, Issue 2, Pages L90-L93Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/698/2/L90
Keywords
cosmology: theory; large-scale structure of universe; methods: statistical
Categories
Funding
- NASA [NNG06GE71G]
- NSF [AMS04-0434413]
- Hungarian National Office for Research and Technology (NKTH)
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We find that nonlinearities in the dark matter power spectrum are dramatically smaller if the density field first undergoes a logarithmic mapping. In the Millennium simulation, this procedure gives a power spectrum with a shape hardly departing from the linear power spectrum for k less than or similar to 1 h Mpc(-1) at all redshifts. Also, this procedure unveils pristine Fisher information on a range of scales reaching a factor of 2-3 smaller than in the standard power spectrum, yielding 10 times more cumulative signal to noise at z = 0.
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