# Planck 2015. XX. Constraints on inflation

@inproceedings{Ade2015Planck2X, title={Planck 2015. XX. Constraints on inflation}, author={P. Ade and N. Aghanim and M. Arnaud and F. Arroja and M. Ashdown and J. Aumont and C. Baccigalupi and M. Ballardini and A. Banday and R. B. Barreiro and N. Bartolo and E. Battaner and K. Benabed and A. Benoit and A. Benoit-L{\'e}vy and J. Bernard and M. Bersanelli and P. Bielewicz and J. Bock and A. Bonaldi and L. Bonavera and J. Bond and J. Borrill and F. Bouchet and F. Boulanger and M. Bucher and C. Burigana and R. C. Butler and E. Calabrese and J. Cardoso and A. Catalano and A. Challinor and A. Chamballu and R. Chary and H. Chiang and P. Christensen and S. Church and D. Clements and S. Colombi and L. Colombo and C. Combet and D. Contreras and F. Couchot and A. Coulais and B. Crill and A. Curto and F. Cuttaia and L. Danese and R. Davies and R. Davis and P. Bernardis and A. Rosa and G. Zotti and J. Delabrouille and F. D{\'e}sert and J. Diego and H. Dole and S. Donzelli and O. Dor{\'e} and M. Douspis and A. Ducout and X. Dupac and G. Efstathiou and F. Elsner and T. Ensslin and H. Eriksen and J. Fergusson and F. Finelli and O. Forni and M. Frailis and A. Fraisse and E. Franceschi and A. Frejsel and A. Frolov and S. Galeotta and S. Galli and K. Ganga and C. Gauthier and M. Giard and Y. Giraud-H{\'e}raud and E. Gjerl{\o}w and J. Gonz{\'a}lez-Nuevo and K. G{\'o}rski and S. Gratton and A. Gregorio and A. Gruppuso and J. Gudmundsson and J. Hamann and W. Handley and F. Hansen and D. Hanson and D. Harrison and S. Henrot-Versill{\'e} and C. Hernandez-Monteagudo and D. Herranz and S. Hildebrandt and E. Hivon and M. Hobson and W. Holmes and A. Hornstrup and W. Hovest and Z. Huang and K. Huffenberger and G. Hurier and A. Jaffe and T. Jaffe and W. Jones and M. Juvela and E. Keihanen and R. Keskitalo and J. Kim and T. Kisner and R. Kneissl and J. Knoche and M. Kunz and H. Kurki-Suonio and G. Lagache and A. Lahteenmaki and J. Lamarre and A. Lasenby and M. Lattanzi and C. Lawrence and R. Leonardi and J. Lesgourgues and F. L{\'e}vrier and A. Lewis and M. Liguori and P. Lilje and M. Linden-Vornle and M. L{\'o}pez-Caniego and P. Lubin and Y. Ma and J. Mac{\'i}as-P{\'e}rez and G. Maggio and D. Maino and N. Mandolesi and A. Mangilli and M. Maris and P. Martin and E. Martinez-Gonzalez and S. Masi and S. Matarrese and P. McGehee and P. Meinhold and A. Melchiorri and L. Mendes and A. Mennella and M. Migliaccio and S. Mitra and M. Miville-Desch{\^e}nes and D. Molinari and A. Moneti and L. Montier and G. Morgante and D. Mortlock and A. Moss and M. Munchmeyer and D. Munshi and J. A. Murphy and P. Naselsky and F. Nati and P. Natoli and C. Netterfield and H. N{\o}rgaard-Nielsen and F. Noviello and D. Novikov and I. Novikov and C. A. Oxborrow and F. Paci and L. Pagano and F. Pajot and R. Paladini and S. Pandolfi and D. Paoletti and F. Pasian and G. Patanchon and T. Pearson and H. 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. Pratt and G. Prezeau and S. Prunet and J. Puget and J. Rachen and W. Reach 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 M. Rowan-Robinson and J. Rubi{\~n}o-Mart{\'i}n and B. Rusholme and M. Sandri and D. Santos and M. Savelainen and G. Savini and D. Scott and M. Seiffert and E. Shellard and M. Shiraishi and L. Spencer and V. Stolyarov and R. Stompor and R. Sudiwala and R. Sunyaev and D. Sutton and A. Suur-Uski and J. Sygnet and J. Tauber and L. Terenzi and L. Toffolatti and M. Tomasi and M. Tristram and T. Trombetti and M. Tucci and J. Tuovinen and L. Valenziano and J. Valiviita and B. Tent and P. Vielva and F. Villa and L. Wade and B. Wandelt and I. Wehus and M. White and D. Yvon and A. Zacchei and J. P. Zibin and A. Zonca}, year={2015} }

We analyse the implications of the Planck data for cosmic inflation. The Planck nominal mission temperature anisotropy measurements, combined with the WMAP large-angle polarization, constrain the scalar spectral index to $n_s = 0.9603 \pm 0.0073$, ruling out exact scale invariance at over 5 $\sigma$. Planck establishes an upper bound on the tensor-to-scalar ratio of r 2 do not provide a good fit to the data. Planck does not find statistically significant running of the scalar spectral index… Expand

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