Please use this identifier to cite or link to this item:
http://hdl.handle.net/2445/127562
Title: | An improved fitting formula for the dark matter bispectrum |
Author: | Gil Marín, Héctor Wagner, Christian Fragkoudi, Frantzeska Jiménez, Raúl (Jiménez Tellado) Verde, Licia |
Keywords: | Cosmologia Matèria fosca (Astronomia) Galàxies Cosmology Dark matter (Astronomy) Galaxies |
Issue Date: | 2012 |
Publisher: | Institute of Physics (IOP) |
Abstract: | In this paper we present an improved fitting formula for the dark matter bispectrum motivated by the previous phenomenological approach of ref. [1]. We use a set of LCDM simulations to calibrate the fitting parameters in the k-range of 0.03 h/Mpc ≤ k ≤ 0.4 h/Mpc and in the redshift range of 0 ≤ z ≤ 1.5. This new proposed fit describes well the BAO-features although it was not designed to. The deviation between the simulations output and our analytic prediction is typically less than 5% and in the worst case is never above 10%. We envision that this new analytic fitting formula will be very useful in providing reliable predictions for the non-linear dark matter bispectrum for LCDM models. |
Note: | Versió postprint del document publicat a: https://doi.org/10.1088/1475-7516/2012/02/047 |
It is part of: | Journal of Cosmology and Astroparticle Physics, 2012, vol. 02, num. 047 |
URI: | http://hdl.handle.net/2445/127562 |
Related resource: | https://doi.org/10.1088/1475-7516/2012/02/047 |
ISSN: | 1475-7516 |
Appears in Collections: | Publicacions de projectes de recerca finançats per la UE Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB)) |
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