The non-linear bispectrum with initial spectral index -1

Details The non-linear bispectrum with initial spectral index -1 The non-linear bispectrum with initial spectral index -1

Apr 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006cha%26a..30..133y&link_type=abstract

Chinese Astronomy and Astrophysics, Volume 30, Issue 2, p. 133-149.

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

Bispectrum, or three-point correlation function in Fourier space, is the lowest order non-Gaussian statistic to study the large-scale structure produced by gravitational instability. In Fourier space, the 2-dimensional density field has the same statistical properties as the 3-dimensional field, and compared with the 3-dimensional fast Fourier transform (FFT), the 2-dimensional FFT can save a lot of computer resources. In a combination of 2- and 3-dimensional FFTs and using a high-resolution N-body numerical simulation with the initial spectral index -1, we have measured the bispectrum from the weakly linear regime to the strongly nonlinear regime. All possible effects of numerical artefacts on the power spectrum and bispectrum, such as particle discreteness, force softening, finite box size and alias effect, are considered and strictly corrected. In contrast with what previous researchers assumed, it is revealed that the reduced bispectrum depends on the triangle shape and scale even in the strongly nonlinear regime, and increases with the wave number. And based on the measured results, a new fitting formula for the bispectum suitable for cosmological models with an initial spectral index -1 is obtained.

Affiliated with

Also associated with

No associations

Rating

The non-linear bispectrum with initial spectral index -1 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The non-linear bispectrum with initial spectral index -1, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The non-linear bispectrum with initial spectral index -1 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1162160