Effects of halo substructure on the power spectrum and bispectrum

• Published in: Monthly notices of the Royal Astronomical Society Vol. 352; no. 3; pp. 1019 - 1027
• Main Authors: Dolney, Derek, Jain, Bhuvnesh, Takada, Masahiro
• Format: Journal Article
• Language: English
• Published: 23 Ainslie Place , Edinburgh EH3 6AJ , UK . Telephone 226 7232 Fax 226 3803 Blackwell Science Ltd 11.08.2004; Blackwell Science
• Subjects: cosmological parameters; dark matter; galaxies: haloes; Galaxy halo; Power spectra; Digital simulation; N body system; Substructure; Large-scale structure; Dark matter; Cosmological parameter; Cosmology; Degeneration; Models; cosmological parameters; Concentration distribution; galaxies: haloes
• ISSN: 0035-8711; 1365-2966
• DOI: 10.1111/j.1365-2966.2004.07999.x

ABSTRACT We study the effects of halo substructure and a distribution in the concentration parameter of haloes on large‐scale structure statistics. The effects on the power spectrum and bispectrum are studied on the smallest scales accessible from future surveys. We compare halo‐model predictions with results based on N‐body simulations, but also extend our predictions to 10‐kpc scales which will be probed by future simulations. We find that weak‐lensing surveys proposed for the coming decade can probe the power spectrum on small enough scales to detect substructure in massive haloes. We discuss the prospects of constraining the mass fraction in substructure in view of partial degeneracies with parameters such as the tilt and running of the primordial power spectrum.