Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Bispectrum as a Signature of Gravitational Instability in
  Redshift-Space   The bispectrum provides a characteristic signature of gravitational
instability that can be used to probe the Gaussianity of the initial conditions
and the bias of the galaxy distribution. We study how this signature is
affected by redshift distortions using perturbation theory and high-resolution
numerical simulations. We obtain perturbative results for the multipole
expansion of the redshift-space bispectrum which provide a natural way to break
the degeneracy between bias and $\Omega$ present in measurements of the
redshift-space power spectrum. We propose a phenomenological model that
incorporates the perturbative results and also describes the bispectrum in the
transition to the non-linear regime. We stress the importance of non-linear
effects and show that inaccurate treatment of these can lead to significant
discrepancies in the determination of bias from galaxy redshift surveys. At
small scales we find that the bispectrum monopole exhibits a strong
configuration dependence that reflects the velocity dispersion of clusters.
Therefore, the hierarchical model for the three-point function does not hold in
redshift-space.

8
The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
1
The categories of this paper are: cs
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys