<i>Planck</i>2018 results

Pourquoi ce travail est-il dans la base ?

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Prédiction distillée sur la base complète

Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.

Catégories candidates

aucune

Catégories consensuelles

aucune

Domaine

Signal candidat: aucuneSignal consensuel: aucune

Devis d'étude

Signal candidat: Sans objetSignal consensuel: aucune

Genre

Signal candidat: EmpiriqueSignal consensuel: aucune

Score de désaccord entre enseignants

0,742

Score d'incertitude au seuil

0,602

Statut de validation

machine_predicted_unvalidated · codex-gemma-dda1882f352a

Scores Codex et Gemma par catégorie

Scores machine (provisoires)

Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.

Écart entre enseignants

0,204 · la distance entre les deux têtes enseignantes sur ce seul travail

Statut de validation

score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découle

Résumé

We describe the legacy Planck cosmic microwave background (CMB) likelihoods derived from the 2018 data release. The overall approach is similar in spirit to the one retained for the 2013 and 2015 data release, with a hybrid method using different approximations at low ( ℓ &lt; 30) and high ( ℓ ≥ 30) multipoles, implementing several methodological and data-analysis refinements compared to previous releases. With more realistic simulations, and better correction and modelling of systematic effects, we can now make full use of the CMB polarization observed in the High Frequency Instrument (HFI) channels. The low-multipole EE cross-spectra from the 100 GHz and 143 GHz data give a constraint on the ΛCDM reionization optical-depth parameter τ to better than 15% (in combination with the TT low- ℓ data and the high- ℓ temperature and polarization data), tightening constraints on all parameters with posterior distributions correlated with τ . We also update the weaker constraint on τ from the joint TEB likelihood using the Low Frequency Instrument (LFI) channels, which was used in 2015 as part of our baseline analysis. At higher multipoles, the CMB temperature spectrum and likelihood are very similar to previous releases. A better model of the temperature-to-polarization leakage and corrections for the effective calibrations of the polarization channels (i.e., the polarization efficiencies) allow us to make full use of polarization spectra, improving the ΛCDM constraints on the parameters θ MC , ω c , ω b , and H 0 by more than 30%, and n s by more than 20% compared to TT-only constraints. Extensive tests on the robustness of the modelling of the polarization data demonstrate good consistency, with some residual modelling uncertainties. At high multipoles, we are now limited mainly by the accuracy of the polarization efficiency modelling. Using our various tests, simulations, and comparison between different high-multipole likelihood implementations, we estimate the consistency of the results to be better than the 0.5 σ level on the ΛCDM parameters, as well as classical single-parameter extensions for the joint likelihood (to be compared to the 0.3 σ levels we achieved in 2015 for the temperature data alone on ΛCDM only). Minor curiosities already present in the previous releases remain, such as the differences between the best-fit ΛCDM parameters for the ℓ &lt; 800 and ℓ &gt; 800 ranges of the power spectrum, or the preference for more smoothing of the power-spectrum peaks than predicted in ΛCDM fits. These are shown to be driven by the temperature power spectrum and are not significantly modified by the inclusion of the polarization data. Overall, the legacy Planck CMB likelihoods provide a robust tool for constraining the cosmological model and represent a reference for future CMB observations.

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La notice

Revue

Astronomy and Astrophysics

Thématique

Cosmology and Gravitation Theories

Domaine

Physics and Astronomy

Établissements canadiens

University of British ColumbiaSimon Fraser UniversityUniversity of Toronto

Organismes subventionnaires

Argonne National LaboratoryJet Propulsion LaboratoryInstituto de Astrofísica de CanariasIstituto Nazionale di Fisica NucleareUK Space AgencyMinistério da Ciência, Tecnologia e Ensino SuperiorAgence Nationale de la RechercheGran Sasso Science InstituteIstituto Nazionale di AstrofisicaCentre National de la Recherche ScientifiqueInstituto de Física de CantabriaMax-Planck-GesellschaftCalifornia Institute of TechnologyTekesFundação para a Ciência e a TecnologiaCentre National d’Etudes SpatialesNational Aeronautics and Space AdministrationPartnership for Advanced Computing in Europe AISBLUniversiteit LeidenUniversidad de CantabriaScience Foundation IrelandChina Scholarship CouncilHaverford CollegeInstitut National de Physique Nucléaire et de Physique des ParticulesScience and Technology Facilities CouncilUniversité Paris-SaclayEuropean Space AgencyImperial College LondonUniversitetet i OsloHelsingin Yliopisto

Mots-clés

Cosmic microwave backgroundPlanckPhysicsReionizationPolarization (electrochemistry)AstrophysicsMultipole expansionRobustness (evolution)Cosmic background radiationSpectral lineComputational physicsAstronomyOpticsAnisotropyQuantum mechanics

Résumé présent dans OpenAlex

oui

API

/api/v1/works/W3103282112