2026-04-17T01:25:46Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/1275622025-12-05T16:16:02Zcom_2072_1057col_2072_478904col_2072_478917

00925njm 22002777a 4500 dc Gil Marín, Héctor author Wagner, Christian author Fragkoudi, Frantzeska author Jiménez, Raúl (Jiménez Tellado) author Verde, Licia author 2019-01-23T12:47:53Z 2019-01-23T12:47:53Z 2012 2019-01-23T12:47:53Z 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. Cosmologia Matèria fosca (Astronomia) Galàxies Cosmology Dark matter (Astronomy) Galaxies An improved fitting formula for the dark matter bispectrum