Gil Marín, HéctorWagner, ChristianFragkoudi, FrantzeskaJiménez, Raúl (Jiménez Tellado)Verde, Licia2019-01-232019-01-2320121475-7516https://hdl.handle.net/2445/127562In 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.17 p.application/pdfeng(c) IOP Publishing and Sissa Medialab, 2012CosmologiaMatèria fosca (Astronomia)GalàxiesCosmologyDark matter (Astronomy)Galaxiesinfo:eu-repo/semantics/article6060992019-01-23info:eu-repo/semantics/openAccess