Planck 2013 results. XXII. Constraints on inflation

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 be ns = 0.9603 ± 0.0073, ruling out exact scale invariance at over 5 s. Planck...

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Autores: Bucher, M., Barreiro, R. Belén, Curto, Andrés, Diego, José María, González-Nuevo, J., Herranz, Diego, López-Caniego, M., Martínez-González, Enrique, Rebolo López, Rafael, Toffolatti, Luigi, Vielva, Patricio, Planck Collaboration
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2014
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:dnet:digitalcsic_::7a948b5b0616698a1c5e2259889ecc23
Acceso en línea:http://hdl.handle.net/10261/110613
Access Level:acceso abierto
Palabra clave:Inflation
Cosmic background radiation
Early Universe
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spelling Planck 2013 results. XXII. Constraints on inflationBucher, M.Barreiro, R. BelénCurto, AndrésDiego, José MaríaGonzález-Nuevo, J.Herranz, DiegoLópez-Caniego, M.Martínez-González, EnriqueRebolo López, RafaelToffolatti, LuigiVielva, PatricioPlanck CollaborationInflationCosmic background radiationEarly UniverseWe 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 be ns = 0.9603 ± 0.0073, ruling out exact scale invariance at over 5 s. Planck establishes an upper bound on the tensor-to-scalar ratio of r< 0.11 (95% CL). The Planck data thus shrink the space of allowed standard inflationary models, preferring potentials with V>< 0. Exponential potential models, the simplest hybrid inflationary models, and monomial potential models of degree n = 2 do not provide a good fit to the data. Planck does not find statistically significant running of the scalar spectral index, obtaining dns/dlnk =-0.0134 ± 0.0090. We verify these conclusions through a numerical analysis, which makes no slow-roll approximation, and carry out a Bayesian parameter estimation and model-selection analysis for a number of inflationary models including monomial, natural, and hilltop potentials. For each model, we present the Planck constraints on the parameters of the potential and explore several possibilities for the post-inflationary entropy generation epoch, thus obtaining nontrivial data-driven constraints. We also present a direct reconstruction of the observable range of the inflaton potential. Unless a quartic term is allowed in the potential, we find results consistent with second-order slow-roll predictions. We also investigate whether the primordial power spectrum contains any features. We find that models with a parameterized oscillatory feature improve the fit by 2eff 10 ; however, Bayesian evidence does not prefer these models. We constrain several single-field inflation models with generalized Lagrangians by combining power spectrum data with Planck bounds on fNL. Planck constrains with unprecedented accuracy the amplitude and possible correlation (with the adiabatic mode) of non-decaying isocurvature fluctuations. The fractional primordial contributions of cold dark matter (CDM) isocurvature modes of the types expected in the curvaton and axion scenarios have upper bounds of 0.25% and 3.9% (95% CL), respectively. In models with arbitrarily correlated CDM or neutrino isocurvature modes, an anticorrelated isocurvature component can improve the 2eff by approximately 4 as a result of slightly lowering the theoretical prediction for the l40 multipoles relative to the higher multipoles. Nonetheless, the data are consistent with adiabatic initial conditions.The development of Planck has been supported by: ESA; CNES and CNRS/INSU-IN2P3-INP (France); ASI, CNR, and INAF (Italy); NASA and DoE (USA); STFC and UKSA (UK); CSIC, MICINN and JA (Spain); Tekes, AoF and CSC (Finland); DLR and MPG (Germany); CSA (Canada); DTU Space (Denmark); SER/SSO (Switzerland); RCN (Norway); SFI (Ireland); FCT/MCTES (Portugal); and PRACE (EU).Peer ReviewedEDP Sciences2015201520142015info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/110613reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://dx.doi.org/10.1051/0004-6361/201321569info:eu-repo/semantics/openAccessoai:dnet:digitalcsic_::7a948b5b0616698a1c5e2259889ecc232026-05-22T06:33:51Z
dc.title.none.fl_str_mv Planck 2013 results. XXII. Constraints on inflation
title Planck 2013 results. XXII. Constraints on inflation
spellingShingle Planck 2013 results. XXII. Constraints on inflation
Bucher, M.
Inflation
Cosmic background radiation
Early Universe
title_short Planck 2013 results. XXII. Constraints on inflation
title_full Planck 2013 results. XXII. Constraints on inflation
title_fullStr Planck 2013 results. XXII. Constraints on inflation
title_full_unstemmed Planck 2013 results. XXII. Constraints on inflation
title_sort Planck 2013 results. XXII. Constraints on inflation
dc.creator.none.fl_str_mv Bucher, M.
Barreiro, R. Belén
Curto, Andrés
Diego, José María
González-Nuevo, J.
Herranz, Diego
López-Caniego, M.
Martínez-González, Enrique
Rebolo López, Rafael
Toffolatti, Luigi
Vielva, Patricio
Planck Collaboration
author Bucher, M.
author_facet Bucher, M.
Barreiro, R. Belén
Curto, Andrés
Diego, José María
González-Nuevo, J.
Herranz, Diego
López-Caniego, M.
Martínez-González, Enrique
Rebolo López, Rafael
Toffolatti, Luigi
Vielva, Patricio
Planck Collaboration
author_role author
author2 Barreiro, R. Belén
Curto, Andrés
Diego, José María
González-Nuevo, J.
Herranz, Diego
López-Caniego, M.
Martínez-González, Enrique
Rebolo López, Rafael
Toffolatti, Luigi
Vielva, Patricio
Planck Collaboration
author2_role author
author
author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Inflation
Cosmic background radiation
Early Universe
topic Inflation
Cosmic background radiation
Early Universe
description 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 be ns = 0.9603 ± 0.0073, ruling out exact scale invariance at over 5 s. Planck establishes an upper bound on the tensor-to-scalar ratio of r< 0.11 (95% CL). The Planck data thus shrink the space of allowed standard inflationary models, preferring potentials with V>< 0. Exponential potential models, the simplest hybrid inflationary models, and monomial potential models of degree n = 2 do not provide a good fit to the data. Planck does not find statistically significant running of the scalar spectral index, obtaining dns/dlnk =-0.0134 ± 0.0090. We verify these conclusions through a numerical analysis, which makes no slow-roll approximation, and carry out a Bayesian parameter estimation and model-selection analysis for a number of inflationary models including monomial, natural, and hilltop potentials. For each model, we present the Planck constraints on the parameters of the potential and explore several possibilities for the post-inflationary entropy generation epoch, thus obtaining nontrivial data-driven constraints. We also present a direct reconstruction of the observable range of the inflaton potential. Unless a quartic term is allowed in the potential, we find results consistent with second-order slow-roll predictions. We also investigate whether the primordial power spectrum contains any features. We find that models with a parameterized oscillatory feature improve the fit by 2eff 10 ; however, Bayesian evidence does not prefer these models. We constrain several single-field inflation models with generalized Lagrangians by combining power spectrum data with Planck bounds on fNL. Planck constrains with unprecedented accuracy the amplitude and possible correlation (with the adiabatic mode) of non-decaying isocurvature fluctuations. The fractional primordial contributions of cold dark matter (CDM) isocurvature modes of the types expected in the curvaton and axion scenarios have upper bounds of 0.25% and 3.9% (95% CL), respectively. In models with arbitrarily correlated CDM or neutrino isocurvature modes, an anticorrelated isocurvature component can improve the 2eff by approximately 4 as a result of slightly lowering the theoretical prediction for the l40 multipoles relative to the higher multipoles. Nonetheless, the data are consistent with adiabatic initial conditions.
publishDate 2014
dc.date.none.fl_str_mv 2014
2015
2015
2015
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/110613
url http://hdl.handle.net/10261/110613
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://dx.doi.org/10.1051/0004-6361/201321569
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv EDP Sciences
publisher.none.fl_str_mv EDP Sciences
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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