Primordial Non-Gaussianity and Bispectrum Measurements in the Cosmic Microwave Background and Large-Scale Structure

By M. Liguori, E. Sefusatti, J. Fergusson, E. Shellard. 2010

213 citations recorded by the source corpus.

The most direct probe of non-Gaussian initial conditions has come from bispectrum measurements of temperature fluctuations in the Cosmic Microwave Background and of the matter and galaxy distribution at large scales. Such bispectrum estimators are expected to continue to provide the best constraints on the non-Gaussian parameters in future observations. We review and compare the theoretical and observational problems, current results, and future prospects for the detection of a nonvanishing primordial component in the bispectrum of the Cosmic Microwave Background and large-scale structure, and the relation to specific predictions from different inflationary models.

Subfields: Astronomy and Astrophysics, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/d046df237f1b0358ece1c8cf11aae841ad2cdae1

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Citations in the corpus

Constraining primordial non-Gaussianity with future galaxy surveys (2011, background): “This is usually done in terms of the bispectrum amplitude fNL for a set of template shapes for the bispectrum of the perturbations (Liguori et al. 2010) (see the Appendix A for a more precise definition).”
Equilateral Non-Gaussianity and New Physics on the Horizon (2011, methodology): “Forecasted 1-σ errors for future experiments are [32, 33]: σ(f NL , f ortho.”
Inflation, Cosmic Perturbations and Non-Gaussianities (2013, background): “[20] M.”
Planck 2015 results. XVII. Constraints on primordial non-Gaussianity (2015, unknown): “Primordial NG is one of the most powerful tests of inflation, and more generally of high-energy early Universe physics (for some reviews, see Bartolo et al. 2004a; Liguori et al. 2010; Chen 2010b; Komatsu 2010; Yadav & Wandelt 2010).”
The DESI Experiment Part I: Science,Targeting, and Survey Design (2016, background): “An exciting realization in inflationary theory is that discerning the scale-dependence, or ‘shape’, of the bispectrum (the 3-point function) could provide a direct insight into the inflationary mechanism, through how non-Gaussianity is generated [173, 174].”
Planck 2018 results. IX. Constraints on primordial non-Gaussianity (2019, methodology): “For more details about specific realizations of inflationary models within each class, see the previous two Planck papers on primordial NG (PCNG13; PCNG15) and reviews (e.g., Bartolo et al. 2004a; Liguori et al. 2010; Chen 2010b; Komatsu 2010; Yadav & Wandelt 2010).”
COrE (Cosmic Origins Explorer) A White Paper (2011, background): “Cosmic microwave background non-Gaussianity is emerging as a powerful new probe of the origin of cosmic structures in the very early Universe and their subsequent evolution (see for example the reviews in [75, 76, 77, 78, 79]).”