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

An improved fitting formula for the dark matter bispectrum Gil Marín, Héctor Wagner, Christian Fragkoudi, Frantzeska Jiménez, Raúl (Jiménez Tellado) Verde, Licia Cosmologia Matèria fosca (Astronomia) Galàxies Cosmology Dark matter (Astronomy) Galaxies 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. 2019-01-23T12:47:53Z 2019-01-23T12:47:53Z 2012 2019-01-23T12:47:53Z info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion 1475-7516 https://hdl.handle.net/2445/127562 606099 eng Versió postprint del document publicat a: https://doi.org/10.1088/1475-7516/2012/02/047 Journal of Cosmology and Astroparticle Physics, 2012, vol. 02, num. 047 https://doi.org/10.1088/1475-7516/2012/02/047 info:eu-repo/grantAgreement/EC/FP7/226354/EU//HERMIONE info:eu-repo/grantAgreement/EC/FP7/240117/EU//PHYS.LSS (c) IOP Publishing and Sissa Medialab, 2012 info:eu-repo/semantics/openAccess 17 p. application/pdf Institute of Physics (IOP) Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))