Constraining the initial conditions of the Universe using large scale structure

@article{Agarwal2013ConstrainingTI,
  title={Constraining the initial conditions of the Universe using large scale structure},
  author={Nishant Agarwal and Shirley Ho and Sarah Shandera},
  journal={Journal of Cosmology and Astroparticle Physics},
  year={2013},
  volume={2014},
  pages={038-038}
}
Primordial non-Gaussianity induces a scale-dependent bias in large scale structure (LSS) data, proportional to fNL/k2 for the exact local ansatz. Recent work has shown that models of inflation that predict a large squeezed limit bispectrum, such as multi-field models and single field inflation with a modified initial state, typically give rise to a generalized local ansatz, with the scale-dependent bias now proportional to NL/kα. We use photometric measurements of the angular power spectrum of… 

Figures and Tables from this paper

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

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.

Squeezing the halo bispectrum: a test of bias models

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,

Biasing and the search for primordial non-Gaussianity beyond the local type

Primordial non-Gaussianity encodes valuable information about the physics of inflation, including the spectrum of particles and interactions. Significant improvements in our understanding of

Constraining primordial non-Gaussianity with bispectrum and power spectrum from upcoming optical and radio surveys

We forecast constraints on primordial non-Gaussianity (PNG) and bias parameters from measurements of galaxy power spectrum and bispectrum in future radio continuum and optical surveys. In the galaxy

Primordial non-Gaussianity from the Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey I: Catalogue Preparation and Systematic Mitigation

A new template constructed using data from the Gaia spacecraft provides the best match to the observed quasar clustering, and a new value-added quasar catalogue with the improved weights to correct for nonlinear imaging systematic effects is made public.

Sloan Digital Sky Survey III photometric quasar clustering: probing the initial conditions of the Universe

The Sloan Digital Sky Survey has surveyed 14,555 square degrees of the sky, and delivered over a trillion pixels of imaging data. We present the large-scale clustering of 1.6 million quasars between

Accurate cosmology with galaxy and quasar surveys

Observations of the cosmic microwave background have led to a golden age of cosmology, where precise measurements can be confronted with predictions from cosmological models. Ongoing and future

Non-Gaussian shape discrimination with spectroscopic galaxy surveys

We consider how galaxy clustering data, from Mpc to Gpc scales, from upcoming large scale structure surveys, such as Euclid and DESI, can provide discriminating information about the bispectrum shape

Testing Inflation with Large Scale Structure: Connecting Hopes with Reality

The statistics of primordial curvature fluctuations are our window into the period of inflation, where these fluctuations were generated. To date, the cosmic microwave background has been the

The Hunt for Primordial Interactions in the Large-Scale Structures of the Universe

The understanding of the primordial mechanism that seeded the cosmic structures we observe today in the sky is one of the major goals in cosmology. The leading paradigm for such a mechanism is

References

SHOWING 1-10 OF 146 REFERENCES

Constraints on local primordial non-Gaussianity from large scale structure

Recent work has shown that the local non-Gaussianity parameter fNL induces a scale dependent bias, whose amplitude is growing with scale. Here we first rederive this result within the context of the

Constraining Primordial Non-Gaussianity with High-Redshift Probes

We present an analysis of the constraints on the amplitude of primordial non-Gaussianity of local type described by the dimensionless parameter fNL. These constraints are set by the auto-correlation

Effects and detectability of quasi-single field inflation in the large-scale structure and cosmic microwave background

Quasi-single field inflation predicts a peculiar momentum dependence in the squeezed limit of the primordial bispectrum which smoothly interpolates between the local and equilateral models. This

Constraints on primordial non-Gaussianity from large scale structure probes

In this paper we measure the angular power spectra C{sub l} of three high-redshift large-scale structure probes: the radio sources from the NRAO VLA Sky Survey (NVSS), the quasar catalogue of Sloan

A generalized local ansatz and its effect on halo bias

Motivated by the properties of early universe scenarios that produce observationally large local non-Gaussianity, we perform N-body simulations with non-Gaussian initial conditions from a generalized

Search for primordial non-Gaussianity in the quasars of SDSS-III BOSS DR9

We analyse the clustering of 22 361 quasars between redshift 2.2 < z < 2.9 observed with the Sloan Digital Sky Survey (SDSS)-III Baryon Oscillation Spectroscopic Survey (BOSS), which are included in

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

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

PRIMORDIAL NON-GAUSSIANITY AND THE NRAO VLA SKY SURVEY

The NRAO VLA Sky Survey (NVSS) is the only data set that allows an accurate determination of the auto-correlation function (ACF) on angular scales of several degrees for active galactic nuclei at z ≃

Prospects for constraining the shape of non-Gaussianity with the scale-dependent bias

We consider whether the non-Gaussian scale-dependent halo bias can be used not only to constrain the local form of non-Gaussianity but also to distinguish among different shapes. In particular, we

Reconciliation of high energy scale models of inflation with Planck

The inflationary cosmology paradigm is very successful in explaining the CMB anisotropy to the percent level. Besides the dependence on the inflationary model, the power spectra, spectral tilt and
...