Bibcode
Planck Collaboration; Ade, P. A. R.; Aghanim, N.; Arnaud, M.; Arroja, F.; Ashdown, M.; Aumont, J.; Baccigalupi, C.; Ballardini, M.; Banday, A. J.; Barreiro, R. B.; Bartolo, N.; Basak, S.; Battaner, E.; Benabed, K.; Benoît, A.; Benoit-Lévy, A.; Bernard, J.-P.; Bersanelli, M.; Bielewicz, P.; Bock, J. J.; Bonaldi, A.; Bonavera, L.; Bond, J. R.; Borrill, J.; Bouchet, F. R.; Boulanger, F.; Bucher, M.; Burigana, C.; Butler, R. C.; Calabrese, E.; Cardoso, J.-F.; Catalano, A.; Challinor, A.; Chamballu, A.; Chiang, H. C.; Christensen, P. R.; Church, S.; Clements, D. L.; Colombi, S.; Colombo, L. P. L.; Combet, C.; Couchot, F.; Coulais, A.; Crill, B. P.; Curto, A.; Cuttaia, F.; Danese, L.; Davies, R. D.; Davis, R. J.; de Bernardis, P.; de Rosa, A.; de Zotti, G.; Delabrouille, J.; Désert, F.-X.; Diego, J. M.; Dole, H.; Donzelli, S.; Doré, O.; Douspis, M.; Ducout, A.; Dupac, X.; Efstathiou, G.; Elsner, F.; Enßlin, T. A.; Eriksen, H. K.; Fergusson, J.; Finelli, F.; Forni, O.; Frailis, M.; Fraisse, A. A.; Franceschi, E.; Frejsel, A.; Galeotta, S.; Galli, S.; Ganga, K.; Gauthier, C.; Ghosh, T.; Giard, M.; Giraud-Héraud, Y.; Gjerløw, E.; González-Nuevo, J.; Górski, K. M.; Gratton, S.; Gregorio, A.; Gruppuso, A.; Gudmundsson, J. E.; Hamann, J.; Hansen, F. K.; Hanson, D.; Harrison, D. L.; Heavens, A.; Helou, G.; Henrot-Versillé, S.; Hernández-Monteagudo, C.; Herranz, D.; Hildebrandt, S. R.; Hivon, E.; Hobson, M.; Holmes, W. A. et al.
Bibliographical reference
Astronomy and Astrophysics, Volume 594, id.A17, 66 pp.
Advertised on:
9
2016
Journal
Citations
722
Refereed citations
645
Description
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 ƒlocalNL = 2.5
± 5.7, ƒequilNL= -16 ± 70, ,
and ƒorthoNL = -34 ± 32 (68% CL,
statistical). Combining temperature and polarization data we obtain
ƒlocalNL = 0.8 ± 5.0,
ƒequilNL= -4 ± 43, and
ƒorthoNL = -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 𝓰localNL = (-0.9
± 7.7 ) X 104(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 ΛCDM
cosmology, namely that the structure we observe today was sourced by
adiabatic, passive, Gaussian, and primordial seed perturbations.