An improved fitting formula for the dark matter bispectrum
  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.
