English

An improved fitting formula for the dark matter bispectrum

Cosmology and Nongalactic Astrophysics 2012-03-08 v2

Abstract

In this paper we present an improved fitting formula for the dark matter bispectrum motivated by the previous phenomenological approach of Scoccimarro & Couchman (2001). 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.

Keywords

Cite

@article{arxiv.1111.4477,
  title  = {An improved fitting formula for the dark matter bispectrum},
  author = {Héctor Gil-Marín and Christian Wagner and Frantzeska Fragkoudi and Raul Jimenez and Licia Verde},
  journal= {arXiv preprint arXiv:1111.4477},
  year   = {2012}
}

Comments

16 pages, 5 figures. Published in JCAP

R2 v1 2026-06-21T19:38:21.035Z