Planck 2015 results. XVII. Constraints on primordial non-Gaussianity

Abstract

The Planck full mission cosmic microwave background(CMB) temperature and E-mode polarization maps are analysed to obtain constraints on primordial non-Gaussianity(NG). Using three classes of optimal bispectrum estimators - separable template-fitting (KSW), binned, and modal - we obtain consistent values for the local, equilateral, and orthogonal bispectrum amplitudes, quoting as our final result from temperature alone fNL^local=2.5+\-5.7, fNL^equil=-16+\-70 and fNL^ortho=-34+\-33(68%CL). Combining temperature and polarization data we obtain fNL^local=0.8+\-5.0, fNL^equil=-4+\-43 and fNL^ortho=-26+\-21 (68%CL). The results are based on cross-validation of these estimators on simulations, are stable across component separation techniques, pass an extensive suite of tests, and are consistent with Minkowski functionals based measurements. The effect of time-domain de-glitching systematics on the bispectrum is negligible. In spite of these test outcomes we conservatively label the results including polarization data as preliminary, owing to a known mismatch of the noise model in simulations and the data. Beyond fNL estimates, we present model-independent reconstructions of the CMB bispectrum and derive constraints on early universe scenarios that generate NG, including general single-field and axion inflation, initial state modifications, parity-violating tensor bispectra, and directionally dependent vector models. We also present a wide survey of scale-dependent oscillatory bispectra, and we look for isocurvature NG. Our constraint on the local primordial trispectrum amplitude is gNL^local=(-9.0+\-7.7)x10^4 (68%CL), and we perform an analysis of additional trispectrum shapes. The global picture is one of consistency with the premises of the LambdaCDM cosmology, namely that the structure we observe today was sourced by adiabatic, passive, Gaussian, and primordial seed perturbations.[abridged]

68 pages, 32 figures, 31 tables. Subsection 6.3 on "Primordial curvature reconstruction" added; analysis in subsection 8.3 extended (paragraph "High frequency resonance model estimator" added); introduction to Section 10 and Appendix B added. This paper is one of a set associated with the 2015 data release from Planck. Matches version accepted for publication in Astronomy & Astrophysics

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• Effect of Priomordial non-Gaussianities on Galaxy Clusters Scaling Relations
• Cosmological consequences of statistical inhomogeneity
• Neural Network Reconstruction of Non-Gaussian Initial Conditions from Dark Matter Halos
• A Novel Bispectrum Estimator of the Kinematic Sunyaev-Zel'dovich Effect using Projected Fields
• Warm Ekpyrosis
• Probing Inflation with Precision Bispectra
• Predicting the Sufficient-Statistics Power Spectrum for Galaxy Surveys: A Recipe for $P_{A\ast }(k)$
• Cosmological Zero Modes
• Constraints on primordial non-Gaussianity from Planck PR4 data
• Characterizing the spatial pattern of solar supergranulation using the bispectrum
• Primordial black holes and scalar-induced gravitational waves from the polynomial attractor model
• Non-Gaussianity of Inflationary Gravitational Waves from the Field Equation
• CMB anisotropies at all orders: the non-linear Sachs-Wolfe formula
• Analytical study of classic models of Hybrid Inflation
• Towards degeneracy breaking of early universe models
• CMB in the river frame and gauge invariance at second order
• Lensing anomalies from the epoch of reionisation
• Inflationary tensor fossils deformed by solid matter -- scalar field interaction
• Unifying inflationary and reheating solution
• Needlet estimation of cross-correlation between CMB lensing maps and LSS
• Cherenkov in the Sky: Measuring the Sound Speed of Primordial Scalar Fluctuations
• A Proposal for Constraining Initial Vacuum by CMB
• Consistency Relation and Non-Gaussianity in a Galileon Inflation
• The scalar-scalar-tensor inflationary three-point function in the axion monodromy model
• Universe bouncing its way to inflation
• A New Class of Non-canonical Conformal Attractors for Multifield Inflation
• Breaking degeneracies with the Sunyaev-Zeldovich full bispectrum
• Inflationary perturbations with Lifshitz scaling
• Where does curvaton reside? Differences between bulk and brane frames
• The comptonization parameter from simulations of single-frequency, single-dish, dual-beam, cm-wave observations of galaxy clusters and mitigating CMB confusion using the Planck sky survey
• The CMB angular power spectrum via component separation: a study on Planck data
• Revisiting the Chern-Simons interaction during inflation with a non-canonical pseudo-scalar
• Constraining primordial non-Gaussianity using Neural Networks
• Morphology of dark matter haloes beyond triaxiality
• Pixel domain multi-resolution minimum variance painting of CMB maps
• Slow-roll corrections in multi-field inflation: a separate universes approach
• Probing the Running of Primordial Bispectrum and Trispectrum using CMB Spectral Distortions
• Squeezed bispectrum from multi-field inflation with curved field space metric
• A revisited Correction to the Halo Mass Function for local-type Primordial non-Gaussianity
• Stable Clustering Ansatz, Consistency Relations and Gravity Dual of Large-Scale Structure
• Towards detecting Primordial non-Gaussianity in the CMB using Spherical Convolutional Neural Networks
• Inflationary study of non-Gaussianity using two-dimensional geometrical measures of CMB temperature maps
• Cross-tests of CMB features in the primordial spectra
• The CMB bispectrum from bouncing cosmologies
• Non-Gaussian Signatures of a Thermal Big Bang