Halo model description of the non-linear dark matter power spectrum at k >> 1 Mpc-1

• Verfasst von: Giocoli, Carlo [VerfasserIn]
• Verfasst von: Bartelmann, Matthias [VerfasserIn]
• Titel: Halo model description of the non-linear dark matter power spectrum at k >> 1 Mpc-1
• Verf.angabe: Carlo Giocoli, Matthias Bartelmann, Ravi K. Sheth, Marcello Cacciato
• Fussnoten: Gesehen am 25.09.2017
• Titel Quelle: Enthalten in: De.arxiv.org
• Jahr Quelle: 2010
• Band/Heft Quelle: (2010) Artikel-Nummer 1003.4740, 15 Seiten
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1563768631

Abstract

Accurate knowledge of the non-linear dark-matter power spectrum is important for understanding the large-scale structure of the Universe, the statistics of dark-matter haloes and their evolution, and cosmological gravitational lensing. We analytically model the dark-matter power spectrum and its cross-power spectrum with dark-matter haloes. Our model extends the halo-model formalism, including realistic substructure population within individual dark-matter haloes and the scatter of the concentration parameter at fixed halo mass. We consider three prescriptions for the mass-concentration relation and two for the substructure distribution in dark-matter haloes. We show that this extension of the halo model mainly increases the predicted power on the small scales, and is crucial for proper modeling the cosmological weak-lensing signal due to low-mass haloes. Our extended formalism shows how the halo model approach can be improved in accuracy as one increases the number of ingredients that are calibrated from n-body simulations.