Probing primordial non-Gaussianity with large-scale structure

Scoccimarro, Román; Sefusatti, Emiliano; Zaldarriaga, Matías

doi:10.1103/physrevd.69.103513

Cited by 199 publications

(342 citation statements)

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“…Redshift evolution can be taken into account approximately by binning in several redshift bins with volume V i . The Fisher matrix is (see for example [52,53])…”

Section: Fisher Forecast Methodologymentioning

confidence: 99%

Prospects for cosmological collider physics

Meerburg

Münchmeyer

Muñoz

et al. 2017

J. Cosmol. Astropart. Phys.

112

120

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It is generally expected that heavy fields are present during inflation, which can leave their imprint in late-time cosmological observables. The main signature of these fields is a small amount of distinctly shaped non-Gaussianity, which if detected, would provide a wealth of information about the particle spectrum of the inflationary Universe. Here we investigate to what extent these signatures can be detected or constrained using futuristic 21-cm surveys. We construct model-independent templates that extract the squeezed-limit behavior of the bispectrum, and examine their overlap with standard inflationary shapes and secondary non-Gaussianities. We then use these templates to forecast detection thresholds for different masses and couplings using a 3D reconstruction of modes during the dark ages (z ∼ 30 − 100). We consider interactions of several broad classes of models and quantify their detectability as a function of the baseline of a dark ages interferometer. Our analysis shows that there exists the tantalizing possibility of discovering new particles with different masses and interactions with future 21-cm surveys. Contents

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“…Redshift evolution can be taken into account approximately by binning in several redshift bins with volume V i . The Fisher matrix is (see for example [52,53])…”

Section: Fisher Forecast Methodologymentioning

confidence: 99%

Prospects for cosmological collider physics

Meerburg

Münchmeyer

Muñoz

et al. 2017

J. Cosmol. Astropart. Phys.

112

120

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“…Our prediction for SDSS should not be compared directly to those derived by Scoccimarro et al (2004), as we have ignored covariance between different bispectrum configurations due to non-linear effects and survey geometry (Sec. 3.2), which was included in their work.…”

Section: N Lmentioning

confidence: 99%

“…This is a rather crude approximation. Scoccimarro et al (2004) have included the full reduced bispectrum covariance plus the peculiar survey geometry, when they calculate the constraints on galaxy bias and primordial non-Gaussianity from the SDSS main sample. Using the same realizations of the survey and the same estimator for the covariance matrix, Sefusatti & Scoccimarro (2005) have compared the analysis with the full covariance matrix (including the observational selection function) and that with an approximate diagonal Gaussian variance.…”

Section: Comments On Covariance Matrixmentioning

confidence: 99%

“…-The Sloan Digital Sky Survey (SDSS) main sample (for which a detailed analysis of the expected constraints on galaxy bias and primordial non-Gaussianity has been given in Scoccimarro et al (2004)) atz = 0 and V = 0.3 h −3 Gpc 3 .…”

Section: Current and Proposed Redshift Surveysmentioning

confidence: 99%

“…The galaxy bispectrum on large scales, or other statistical tools that are sensitive to the higher-order correlation of galaxies, are sensitive to statistical properties of primordial fluctuations: primordial non-Gaussianity (Fry & Scherrer 1994;Chodorowski & Bouchet 1996;Scoccimarro 2000;Verde et al 2000;Durrer et al 2000;Scoccimarro et al 2004;Hikage et al 2006). The common belief is that the cosmic microwave background (CMB) is most sensitive to primordial non-Gaussianity; however, the number of Fourier modes available in the galaxy survey data is much larger than that in the CMB data, as the former probes the full three-dimensional structure of density fields.…”

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confidence: 99%

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Bispectrum of galaxies from high-redshift galaxy surveys: Primordial non-Gaussianity and nonlinear galaxy bias

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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 determination of linear and non-linear bias parameters of intermediate and high-z galaxies, when all measurable triangle configurations down to mildly non-linear scales, where perturbation theory is still valid, are included. The bispectrum is also a powerful probe of primordial non-Gaussianity. The planned galaxy surveys at z 2 should yield constraints on non-Gaussian parameters, f loc.N L and f eq. N L , that are comparable to, or even better than, those from CMB experiments. We study how these constraints improve with volume, redshift range, as well as the number density of galaxies. Finally, we show that a halo occupation distribution may be used to improve these constraints further by lifting degeneracies between gravity, bias, and primordial non-Gaussianity.

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Consistency Relations of the Large Scale Structure

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2016

Springer Theses

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Probing primordial non-Gaussianity with large-scale structure

Abstract: [twocolumn,english,prd]revtex4 graphicx plain alpha 6.5in 7.8in 0.1in 0.1in 0.3in 1

Cited by 199 publications

References 65 publications

Prospects for cosmological collider physics

Prospects for cosmological collider physics

Bispectrum of galaxies from high-redshift galaxy surveys: Primordial non-Gaussianity and nonlinear galaxy bias

Consistency Relations of the Large Scale Structure

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