{"paper":{"title":"Planck 2015 results. XIV. Dark energy and modified gravity","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"A. A. Fraisse, A. Beno\\^it, A. Benoit-L\\'evy, A. Bonaldi, A. Catalano, A. Challinor, A. Chamballu, A. Coulais, A. Curto, A. De Rosa, A. Ducout, A. Frejsel, A. Gregorio, A. Gruppuso, A. Heavens, A. H. Jaffe, A. Hornstrup, A. J. Banday, A. L\\\"ahteenm\\\"aki, A. Lasenby, A. Lewis, A. Mangilli, A. Marchini, A. Melchiorri, A. Mennella, A. Moneti, A. Moss, A. Narimani, A. Renzi, A.-S. Suur-Uski, A. Zacchei, A. Zonca, B. D. Wandelt, B. M. Schaefer, B. P. Crill, B. Rusholme, B. Van Tent, C. A. Oxborrow, C. Baccigalupi, C. B. Netterfield, C. Burigana, C. Combet, C. Hern\\'andez-Monteagudo, C. Renault, C. R. Lawrence, C. Rosset, D. Hanson, D. Herranz, D. L. Clements, D. L. Harrison, D. Mortlock, D. Munshi, D. Novikov, D. Paoletti, D. Pietrobon, D. Santos, D. Scott, D. Sutton, D. Yvon, E. Battaner, E. Calabrese, E. Franceschi, E. Gjerl{\\o}w, E. Hivon, E. Keih\\\"anen, E. Mart\\'inez-Gonz\\'alez, E. Pierpaoli, E. Pointecouteau, E. P. S. Shellard, F. Couchot, F. Cuttaia, F. Elsner, F. Finelli, F. K. Hansen, F. Levrier, F. Nati, F. Noviello, F. Paci, F. Pajot, F. Pasian, F. Perrotta, F. Piacentini, F. R. Bouchet, F. Villa, F.-X. D\\'esert, G. de Zotti, G. Efstathiou, G. Helou, G. Hurier, G. Lagache, G. Maggio, G. Morgante, G. Patanchon, G. Polenta, G. Pr\\'ezeau, G. Rocha, G. Roudier, G. Savini, G. W. Pratt, H. C. Chiang, H. Dole, H. K. Eriksen, H. Kurki-Suonio, H. U. N{\\o}rgaard-Nielsen, I. K. Wehus, I. Novikov, I. Ristorcelli, J. A. Murphy, J. A. Rubi\\~no-Mart\\'in, J. A. Tauber, J. Aumont, J. Borrill, J. Delabrouille, J. E. Gudmundsson, J.-F. Cardoso, J. Fergusson, J. F. Mac\\'ias-P\\'erez, J.-F. Sygnet, J. Gonz\\'alez-Nuevo, J. Knoche, J. Lesgourgues, J.-L. Puget, J. M. Diego, J.-M. Lamarre, J.-P. Bernard, J. P. Rachen, J. R. Bond, J. Tuovinen, J. Valiviita, K. Benabed, K. Ganga, K. M. G\\'orski, K. M. Huffenberger, L. A. Wade, L. Bonavera, L. Danese, L. D. Spencer, L. Mendes, L. Montier, L. Pagano, L. Perotto, L. P. L. Colombo, L. Popa, L. Terenzi, L. Toffolatti, L. Valenziano, M.-A. Miville-Desch\\^enes, M. Arnaud, M. Ashdown, M. Bersanelli, M. Bucher, M. Douspis, M. D. Seiffert, M. Frailis, M. Giard, M. Hobson, M. Juvela, M. Kunz, M. Lattanzi, M. Liguori, M. Linden-V{\\o}rnle, M. L\\'opez-Caniego, M. Martinelli, M. Migliaccio, M. Piat, M. Reinecke, M. Remazeilles, M. Rossetti, M. Rowan-Robinson, M. Sandri, M. Savelainen, M. Tomasi, M. Tristram, M. Tucci, M. Viel, M. White, N. Aghanim, N. Bartolo, N. Mandolesi, O. Dor\\'e, O. Forni, O. Perdereau, P. Bielewicz, P. B. Lilje, P. De Bernardis, P. G. Martin, Planck Collaboration: P. A. R. Ade, P. Mazzotta, P. McGehee, P. M. Lubin, P. Naselsky, P. Natoli, P. R. Christensen, P. R. Meinhold, P. Vielva, R. Battye, R. B. Barreiro, R. C. Butler, R. D. Davies, R. J. Davis, R. Keskitalo, R. Leonardi, R. Rebolo, R. Stompor, R. Sudiwala, R. Sunyaev, S. Church, S. Colombi, S. Donzelli, S. Galeotta, S. Galli, S. Gratton, S. Henrot-Versill\\'e, S. Masi, S. Matarrese, S. Mitra, S. Plaszczynski, S. Prunet, S. R. Hildebrandt, T. A. En{\\ss}lin, T. J. Pearson, T. R. Jaffe, T. S. Kisner, V. Pettorino, V. Salvatelli, V. Stolyarov, W. A. Holmes, W. C. Jones, W. Hovest, W. T. Reach, X. Dupac, Y. Giraud-H\\'eraud, Y.-Z. Ma, Z. Huang","submitted_at":"2015-02-05T15:08:34Z","abstract_excerpt":"We study the implications of Planck data for models of dark energy (DE) and modified gravity (MG), beyond the cosmological constant scenario. We start with cases where the DE only directly affects the background evolution, considering Taylor expansions of the equation of state, principal component analysis and parameterizations related to the potential of a minimally coupled DE scalar field. When estimating the density of DE at early times, we significantly improve present constraints. We then move to general parameterizations of the DE or MG perturbations that encompass both effective field t"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1502.01590","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}