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An improved fitting formula for the dark matter bispectrum

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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.

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Journal of Cosmology and Astroparticle Physics, 2012, vol. 02, num. 047

# metadata.dc.rights[].value
(c) IOP Publishing and Sissa Medialab, 2012

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Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))

# metadata.dc.title[].value
An improved fitting formula for the dark matter bispectrum