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]
Cite
@article{arxiv.1502.01592,
title = {Planck 2015 results. XVII. Constraints on primordial non-Gaussianity},
author = {Planck Collaboration and P. A. R. Ade and N. Aghanim and M. Arnaud and F. Arroja and M. Ashdown and J. Aumont and C. Baccigalupi and M. Ballardini and A. J. Banday and R. B. Barreiro and N. Bartolo and S. Basak and E. Battaner and K. Benabed and A. Benoît and A. Benoit-Lévy and J. -P. Bernard and M. Bersanelli and P. Bielewicz and J. J. Bock and A. Bonaldi and L. Bonavera and J. R. Bond and J. Borrill and F. R. Bouchet and F. Boulanger and M. Bucher and C. Burigana and R. C. Butler and E. Calabrese and J. -F. Cardoso and A. Catalano and A. Challinor and A. Chamballu and H. C. Chiang and P. R. Christensen and S. Church and D. L. Clements and S. Colombi and L. P. L. Colombo and C. Combet and F. Couchot and A. Coulais and B. P. Crill and A. Curto and F. Cuttaia and L. Danese and R. D. Davies and R. J. Davis and P. de Bernardis and A. de Rosa and G. de Zotti and J. Delabrouille and F. -X. Désert and J. M. Diego and H. Dole and S. Donzelli and O. Doré and M. Douspis and A. Ducout and X. Dupac and G. Efstathiou and F. Elsner and T. A. Enßlin and H. K. Eriksen and J. Fergusson and F. Finelli and O. Forni and M. Frailis and A. A. Fraisse and E. Franceschi and A. Frejsel and S. Galeotta and S. Galli and K. Ganga and C. Gauthier and T. Ghosh and M. Giard and Y. Giraud-Héraud and E. Gjerløw and J. González-Nuevo and K. M. Górski and S. Gratton and A. Gregorio and A. Gruppuso and J. E. Gudmundsson and J. Hamann and F. K. Hansen and D. Hanson and D. L. Harrison and A. Heavens and G. Helou and S. Henrot-Versillé and C. Hernández-Monteagudo and D. Herranz and S. R. Hildebrandt and E. Hivon and M. Hobson and W. A. Holmes and A. Hornstrup and W. Hovest and Z. Huang and K. M. Huffenberger and G. Hurier and A. H. Jaffe and T. R. Jaffe and W. C. Jones and M. Juvela and E. Keihänen and R. Keskitalo and J. Kim and T. S. Kisner and J. Knoche and M. Kunz and H. Kurki-Suonio and F. Lacasa and G. Lagache and A. Lähteenmäki and J. -M. Lamarre and A. Lasenby and M. Lattanzi and C. R. Lawrence and R. Leonardi and J. Lesgourgues and F. Levrier and A. Lewis and M. Liguori and P. B. Lilje and M. Linden-Vørnle and M. López-Caniego and P. M. Lubin and J. F. Macías-Pérez and G. Maggio and D. Maino and N. Mandolesi and A. Mangilli and D. Marinucci and M. Maris and P. G. Martin and E. Martínez-González and S. Masi and S. Matarrese and P. McGehee and P. R. Meinhold and A. Melchiorri and L. Mendes and A. Mennella and M. Migliaccio and S. Mitra and M. -A. Miville-Deschênes and A. Moneti and L. Montier and G. Morgante and D. Mortlock and A. Moss and M. Münchmeyer and D. Munshi and J. A. Murphy and P. Naselsky and F. Nati and P. Natoli and C. B. Netterfield and H. U. Nørgaard-Nielsen and F. Noviello and D. Novikov and I. Novikov and C. A. Oxborrow and F. Paci and L. Pagano and F. Pajot and D. Paoletti and F. Pasian and G. Patanchon and H. V. Peiris and O. Perdereau and L. Perotto and F. Perrotta and V. Pettorino and F. Piacentini and M. Piat and E. Pierpaoli and D. Pietrobon and S. Plaszczynski and E. Pointecouteau and G. Polenta and L. Popa and G. W. Pratt and G. Prézeau and S. Prunet and J. -L. Puget and J. P. Rachen and B. Racine and R. Rebolo and M. Reinecke and M. Remazeilles and C. Renault and A. Renzi and I. Ristorcelli and G. Rocha and C. Rosset and M. Rossetti and G. Roudier and J. A. Rubiño-Martín and B. Rusholme and M. Sandri and D. Santos and M. Savelainen and G. Savini and D. Scott and M. D. Seiffert and E. P. S. Shellard and M. Shiraishi and K. Smith and L. D. Spencer and V. Stolyarov and R. Stompor and R. Sudiwala and R. Sunyaev and P. Sutter and D. Sutton and A. -S. Suur-Uski and J. -F. Sygnet and J. A. Tauber and L. Terenzi and L. Toffolatti and M. Tomasi and M. Tristram and A. Troja and M. Tucci and J. Tuovinen and L. Valenziano and J. Valiviita and F. Van Tent and P. Vielva and F. Villa and L. A. Wade and B. D. Wandelt and I. K. Wehus and D. Yvon and A. Zacchei and A. Zonca},
journal= {arXiv preprint arXiv:1502.01592},
year = {2016}
}
Comments
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