# Primordial non-Gaussianity in the bispectrum of the halo density field

@article{Baldauf2011PrimordialNI, title={Primordial non-Gaussianity in the bispectrum of the halo density field}, author={Tobias Baldauf and Uros Seljak and Leonardo Senatore}, journal={Journal of Cosmology and Astroparticle Physics}, year={2011}, volume={2011}, pages={006-006} }

The bispectrum vanishes for linear Gaussian fields and is thus a sensitive probe of non-linearities and non-Gaussianities in the cosmic density field. Hence, a detection of the bispectrum in the halo density field would enable tight constraints on non-Gaussian processes in the early Universe and allow inference of the dynamics driving inflation. We present a tree level derivation of the halo bispectrum arising from non-linear clustering, non-linear biasing and primordial non-Gaussianity. A…

## Figures and Tables from this paper

## 79 Citations

Primordial non-Gaussianity in the bispectra of large-scale structure

- Physics
- 2014

The statistics of large-scale structure in the Universe can be used to probe non-Gaussianity of the primordial density field, complementary to existing constraints from the cosmic microwave…

Non-local bias in the halo bispectrum with primordial non-Gaussianity

- Physics
- 2015

Primordial non-Gaussianity can lead to a scale-dependent bias in the density of collapsed halos relative to the underlying matter density. The galaxy power spectrum already provides constraints on…

Squeezing the halo bispectrum: a test of bias models

- Physics
- 2015

We study the halo-matter cross bispectrum in the presence of primordial non-Gaussianity of the local type. We restrict ourselves to the squeezed limit, for which the calculation are straightforward,…

The halo bispectrum in N-body simulations with non-Gaussian initial conditions: The halo bispectrum and non-Gaussian initial conditions

- Physics
- 2012

We present measurements of the bispectrum of dark matter halos in numerical simulations with non-Gaussian initial conditions of the local type. We show, in the first place, that the overall effect of…

M ay 2 01 4 Primordial non-Gaussianity in the bispectra of large-scale structure

- 2014

The statistics of large-scale structure in the Universe can be used to probe non-Gaussianity of the primordial density field, complementary to existing constraints from the cosmic microwave…

Primordial non-Gaussianity from biased tracers: likelihood analysis of real-space power spectrum and bispectrum

- Physics
- 2020

Upcoming galaxy redshift surveys promise to significantly improve current limits on primordial non-Gaussianity (PNG) through measurements of 2- and 3-point correlation functions in Fourier space.…

Primordial non-Gaussianity in the large-scale structure of the Universe

- Physics
- 2016

Primordial fluctuations are expected to be produced in the very early Universe, sourcing the anisotropies in the cosmic microwave background and seeding the formation of structures. In this thesis we…

The effect of local non-Gaussianity on the matter bispectrum at small scales

- Physics
- 2012

We compute the matter bispectrum in the presence of primordial local non-Gaussianity over a wide range of scales, including the very small nonlinear ones. We use the Halo Model approach, considering…

Galaxy bispectrum, primordial non-Gaussianity and redshift space distortions

- Physics
- 2016

Measurements of the non-Gaussianity of the primordial density field have the power to considerably improve our understanding of the physics of inflation. Indeed, if we can increase the precision of…

Constraining primordial non-Gaussianity with moments of the large-scale density field

- Physics
- 2014

We use cosmological N-body simulations to investigate whether measurements of the moments of large-scale structure can yield constraints on primordial non-Gaussianity. We measure the variance,…

## References

SHOWING 1-10 OF 126 REFERENCES

The matter bispectrum in N-body simulations with non-Gaussian initial conditions

- Physics
- 2010

We present measurements of the bispectrum of dark matter haloes in numerical simulations with non-Gaussian initial conditions of local type. We show, in the first place, that the overall effect of…

Halo clustering with nonlocal non-Gaussianity

- Physics
- 2010

We show how the peak-background split (PBS) can be generalized to predict the effect of nonlocal primordial non-Gaussianity on the clustering of halos. Our approach is applicable to arbitrary…

Non-Gaussian halo assembly bias

- Physics
- 2010

The strong dependence of the large-scale dark matter halo bias on the (local) non-Gaussianity parameter, fNL, offers a promising avenue towards constraining primordial non-Gaussianity with…

Scale dependence of halo bispectrum from non-Gaussian initial conditions in cosmological N-body simulations

- Physics
- 2009

We study the halo bispectrum from non-Gaussian initial conditions. Based on a set of large N-body simulations starting from initial density fields with local type non-Gaussianity, we find that the…

The non-Gaussian halo mass function with fNL, gNL and τNL

- Physics
- 2011

Primordial non-Gaussianity has emerged as one of the most promising probes of the inflationary epoch. While the cosmic microwave background and large-scale halo bias currently provide the most…

Nonlinear clustering in models with primordial non-Gaussianity: the halo model approach

- Physics
- 2010

We develop the halo model of large-scale structure as an accurate tool for probing primordial non-Gaussianity (PNG). In this study we focus on understanding the matter clustering at several redshifts…

Imprints of primordial non-Gaussianities on large-scale structure: Scale-dependent bias and abundance of virialized objects

- Physics
- 2008

We study the effect of primordial non-Gaussianity on large-scale structure, focusing upon the most massive virialized objects. Using analytic arguments and N-body simulations, we calculate the mass…

The bispectrum of galaxies from high-redshift galaxy surveys: Primordial non-Gaussianity and non-linear galaxy bias

- Physics
- 2007

The greatest challenge in the interpretation of galaxy clustering data from any surveys is galaxy bias. Using a simple Fisher matrix analysis, we show that the bispectrum provides an excellent…

The Effect of Primordial Non-Gaussianity on Halo Bias

- Physics
- 2008

It has long been known how to analytically relate the clustering properties of the collapsed structures (halos) to those of the underlying dark matter distribution for Gaussian initial conditions.…

Probing primordial non-Gaussianity: the 3D Bispectrum of Ly-α forest and the redshifted 21-cm signal from the post reionization epoch

- Physics
- 2013

We explore possibility of using the three dimensional bispectra of the Ly-α forest and the redshifted 21-cm signal from the post-reionization epoch to constrain primordial non-Gaussianity. Both these…