A Robust Measure of Cosmic Structure beyond the Power Spectrum: Cosmic Filaments and the Temperature of Dark Matter
Abstract
We discover that the mass of dark matter particles m _{DM} is imprinted in phase correlations of the cosmic density field more significantly than in the twopoint correlation. In particular, phase correlations trace m _{DM} out to scales about five times larger than the twopoint correlation. This result relies on a new estimator l(r) of pure phase information in Fourier space, which can be interpreted as a parameterfree and scaleinvariant tracer of filamentlike structure. Based on simulated density fields, we show how m _{DM} can, in principle, be measured using l(r), given a suitably reconstructed density field.
 Publication:

The Astrophysical Journal
 Pub Date:
 January 2013
 DOI:
 10.1088/0004637X/762/2/115
 arXiv:
 arXiv:1211.5213
 Bibcode:
 2013ApJ...762..115O
 Keywords:

 cosmology: theory;
 dark matter;
 largescale structure of universe;
 Astrophysics  Cosmology and Extragalactic Astrophysics;
 Physics  Data Analysis;
 Statistics and Probability
 EPrint:
 15 pages, 11 figures