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Planck 2013 Results. XXIV. Constraints on primordial non-Gaussianity

P.A.R. Ade N. Aghanim C. Armitage-Caplan M. Arnaud M. Ashdown F. Atrio-Barandela J. Aumont C. Baccigalupi A. J. Banday R. B. Barreiro J.G. Bartlett 1, 2 N. Bartolo E. Battaner K. Benabed A. Benoît 3 A. Benoit-Lévy J. -P. Bernard M. Bersanelli P. Bielewicz J. Bobin J. J. Bock A. Bonaldi L. Bonavera J. R. Bond J. Borrill F. R. Bouchet M. Bridges M. Bucher 2 C. Burigana R. C. Butler J.-F. Cardoso 2 A. Catalano 4, 5 A. Challinor A. Chamballu L. -Y Chiang H. C. Chiang P. R. Christensen S. Church D. L. Clements S. Colombi L. P. L. Colombo F. Couchot 6 A. Coulais 5 B. P. Crill A. Curto F. Cuttaia R. D. Davies R. J. Davis P. de Bernardis A. de Rosa G. de Zotti J. Delabrouille 7, 2 J. -M. Delouis F. -X. Désert J. M. Diego H. Dole S. Donzelli O. Doré M. Douspis A. Ducout J. Dunkley X. Dupac G. Efstathiou F. Elsner T. A. Enßlin H. K. Eriksen J. Fergusson F. Finelli O. Forni M. Frailis E. Franceschi S. Galeotta K. Ganga 2 M. Giard Y. Giraud-Héraud 2 J. González-Nuevo K. M. Górski S. Gratton A. Gregorio A. Gruppuso F. K. Hansen D. Hanson D. Harrison A. Heavens S. Henrot-Versillé 6 C. Hernández-Monteagudo D. Herranz S. R. Hildebrandt E. Hivon M. Hobson W. A. Holmes A. Hornstrup W. Hovest K. M. Huffenberger T. R. Jaffe A. H. Jaffe W. C. Jones M. Juvela E. Keihänen R. Keskitalo T. S. Kisner J. Knoche M. Kunz H. Kurki-Suonio F. Lacasa Guilaine Lagache A. Lähteenmäki J. -M. Lamarre 5 A. Lasenby R. J. Laureijs C. R. Lawrence J. P. Leahy R. Leonardi J. Lesgourgues A. Lewis M. Liguori P. B. Lilje M. Linden-Vørnle M. López-Caniego P. M. Lubin J.F. Macías-Pérez 4 B. Maffei D. Maino N. Mandolesi A. Mangilli D. Marinucci M. Maris D. J. Marshall P. G. Martin E. Martínez-González S. Masi S. Matarrese F. Matthai P. Mazzotta A. Melchiorri L. Mendes A. Mennella M. Migliaccio Subhabrata Mitra M. -A. Miville-Deschênes A. Moneti L. Montier G. Morgante D. Mortlock A. Moss D. Munshi P. Naselsky P. Natoli C. B. Netterfield H. U. Nørgaard-Nielsen F. Noviello D. Novikov I. Novikov S. Osborne C. A. Oxborrow F. Paci L. Pagano F. Pajot D. Paoletti G. Patanchon 2 H. V. Peiris O. Perdereau 6 L. Perotto 4 F. Perrotta F. Piacentini M. Piat 2 E. Pierpaoli D. Pietrobon Stéphane Plaszczynski 6 E. Pointecouteau G. Polenta N. Ponthieu L. Popa T. Poutanen G. W. Pratt G. Prézeau S. Prunet J. -L. Puget J. P. Rachen B. Racine 2 R. Rebolo M. Reinecke M. Remazeilles 2 C. Renault 4 A. Renzi S. Ricciardi T. Riller I. Ristorcelli G. Rocha C. Rosset 2 G. Roudier 2, 5 J. A. Rubiño-Martín B. Rusholme M. Sandri D. Santos 4 G. Savini D. Scott M. D. Seiffert E. P. S. Shellard K. Smith L. D. Spencer Jean-Luc Starck V. Stolyarov Radek Stompor 2 R. Sudiwala R. Sunyaev F. Sureau D. Sutton A. -S. Suur-Uski J. -F. Sygnet J. A. Tauber D. Tavagnacco L. Terenzi L. Toffolatti M. Tomasi M. Tristram 6 M. Tucci 6 J. Tuovinen L. Valenziano J. Valiviita B. van Tent J. Varis P. Vielva F. Villa N. Vittorio L. A. Wade B. D. Wandelt S. D. M. White M. White D. Yvon A. Zacchei A. Zonca
Abstract : The Planck nominal mission cosmic microwave background (CMB) maps yield unprecedented constraints on primordial non-Gaussianity (NG). Using three 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 f_NL^local=2.7 +/- 5.8, f_NL^equil= -42 +/- 75, and f_NL^ortho= -25 +/- 39 (68% CL statistical); and we find the Integrated-Sachs-Wolfe-lensing bispectrum expected in the LambdaCDM scenario. 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 confirmed by skew-C_l, wavelet bispectrum and Minkowski functional estimators. Beyond estimates of individual shape amplitudes, we present model-independent, three-dimensional reconstructions of the Planck CMB bispectrum and thus derive constraints on early-Universe scenarios that generate primordial NG, including general single-field models of inflation, excited initial states (non-Bunch-Davies vacua), and directionally-dependent vector models. We provide an initial survey of scale-dependent feature and resonance models. These results bound both general single-field and multi-field model parameter ranges, such as the speed of sound, c_s \geq 0.02 (95% CL), in an effective field theory parametrization, and the curvaton decay fraction r_D \geq 0.15 (95% CL). The Planck data put severe pressure on ekpyrotic/cyclic scenarios. The amplitude of the four-point function in the local model tau_NL< 2800 (95% CL). Taken together, these constraints represent the highest precision tests to date of physical mechanisms for the origin of cosmic structure.
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Submitted on : Monday, March 25, 2013 - 10:34:06 AM
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P.A.R. Ade, N. Aghanim, C. Armitage-Caplan, M. Arnaud, M. Ashdown, et al.. Planck 2013 Results. XXIV. Constraints on primordial non-Gaussianity. Astronomy and Astrophysics - A&A, EDP Sciences, 2014, 571, pp.A24. ⟨10.1051/0004-6361/201321554⟩. ⟨in2p3-00804189⟩

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