Artículos de revistas
Planck 2015 results XVII. Constraints on primordial non-Gaussianity
Fecha
2016-10-01Registro en:
Astronomy & Astrophysics. Les Ulis Cedex A: Edp Sciences S A, v. 594, 66 p., 2016.
1432-0746
10.1051/0004-6361/201525836
WOS:000385832200016
WOS000385832200016.pdf
Autor
Universidade de São Paulo (USP)
Aalto Univ
African Inst Math Sci
Agenzia Spaziale Italiana
Aix Marseille Univ
Univ Cambridge
Univ KwaZulu Natal
CGEE
Univ Toronto
IRAP
Trinity Coll Dublin
CALTECH
CEFCA
Lawrence Berkeley Natl Lab
CSIC
CEA Saclay
Tech Univ Denmark
Univ Geneva
Univ La Laguna
Univ Oviedo
Radboud Univ Nijmegen
Univ British Columbia
Univ Southern Calif
UCL
Univ Sussex
Florida State Univ
Univ Helsinki
Princeton Univ
Univ Calif Santa Barbara
Univ Illinois
Univ Padua
Univ Bologna
Univ Ferrara
Univ Roma La Sapienza
Univ Milan
Univ Trieste
Univ Roma Tor Vergata
Niels Bohr Inst
Univ Copenhagen
European Space Agcy
Ist Nazl Fis Nucl
HGSFP
Heidelberg Univ
Universidade Estadual Paulista (Unesp)
INAF Osservatorio Astron Padova
INAF Osservatorio Astron Roma
INAF Osservatorio Astron Trieste
INAF IASF Bologna
INAF IASF Milano
Univ Roma
INFN Natl Inst Nucl Phys
Univ Grenoble Alpes
IUCAA
Imperial Coll London
Univ Joseph Fourier Grenoble I
Inst Univ France
Univ Paris Saclay
CNRS
Rhein Westfal TH Aachen
Inst Space Sci
Univ Oslo
Inst Astrofis Canarias
Univ Cantabria
Univ Manchester
Univ Chicago
Kavli Inst Cosmol Cambridge
Kazan Fed Univ
Univ Paris 11
Observ Paris
Telecom ParisTech
Univ Paris Sud 11
Russian Acad Sci
Natl Taiwan Univ
Max Planck Inst Astrophys
McGill Univ
Natl Univ Ireland
Nicolaus Copernicus Astron Ctr
Nordita Nord Inst Theoret Phys
Perimeter Inst Theoret Phys
SISSA
Univ E Campus
Cardiff Univ
Univ Nottingham
Sorbonne Univ UPMC
Univ Calif Berkeley
Stanford Univ
Univ Oxford
Univ Sydney
Stockholm Univ
CERN
UPMC Univ Paris 06
Univ Toulouse
Univ Granada
Univ Warsaw Observ
Institución
Resumen
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 primordial local, equilateral, and orthogonal bispectrum amplitudes, quoting as our final result from temperature alone f(NL)(local) = 2.5 +/- 5.7, f(NL)(equil) = 16 +/- 70, and f(NL)(ortho) = 34 +/- 33 (68% CL, statistical). Combining temperature and polarization data we obtain f(NL)(local) = 0.8 +/- 5.0, f(NL)(equil) = 4 +/- 43, and f(NL)(ortho) = 26 +/- 21 (68% CL, statistical). The results are based on comprehensive cross-validation of these estimators on Gaussian and non-Gaussian simulations, are stable across component separation techniques, pass an extensive suite of tests, and are consistent with estimators based on measuring the Minkowski functionals of the CMB. 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 estimates of individual shape amplitudes, we present model-independent, three-dimensional reconstructions of the Planck CMB bispectrum and derive constraints on early universe scenarios that generate primordial NG, including general single-field models of inflation, axion inflation, initial state modifications, models producing parity-violating tensor bispectra, and directionally dependent vector models. We present a wide survey of scale-dependent feature and resonance models, accounting for the look elsewhere effect in estimating the statistical significance of features. We also look for isocurvature NG, and find no signal, but we obtain constraints that improve significantly with the inclusion of polarization. The primordial trispectrum amplitude in the local model is constrained to be g(NL)(local) = (9.0 +/- 7.7) x 10(4) (68% CL statistical), and we perform an analysis of trispectrum shapes beyond the local case. The global picture that emerges is one of consistency with the premises of the Lambda CDM cosmology, namely that the structure we observe today was sourced by adiabatic, passive, Gaussian, and primordial seed perturbations.