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  Planck 2018 results - VI. Cosmological parameters

Aghanim, N., Akrami, Y., Ashdown, M., Aumont, J., Baccigalupi, C., Ballardini, M., et al. (2020). Planck 2018 results - VI. Cosmological parameters. Astronomy and Astrophysics, 641: A6. doi:10.1051/0004-6361/201833910.

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Aghanim, N., Author
Akrami, Y., Author
Ashdown, M., Author
Aumont, J., Author
Baccigalupi, C., Author
Ballardini, M., Author
Banday, A. J., Author
Barreiro, R. B., Author
Bartolo, N., Author
Basak, S., Author
Battye, R., Author
Benabed, K., Author
Bernard, J.-P., Author
Bersanelli, M., Author
Bielewicz, P., Author
Bock, J. J., Author
Bond, J. R., Author
Borrill, J., Author
Bouchet, F. R., Author
Boulanger, F., Author
Bucher, M., AuthorBurigana, C., AuthorButler, R. C., AuthorCalabrese, E., AuthorCardoso, J.-F., AuthorCarron, J., AuthorChallinor, A., AuthorChiang, H. C., AuthorChluba, J., AuthorColombo, L. P. L., AuthorCombet, C., AuthorContreras, D., AuthorCrill, B. P., AuthorCuttaia, F., Authorde Bernardis, P., Authorde Zotti, G., AuthorDelabrouille, J., AuthorDelouis, J.-M., AuthorValentino, E. Di, AuthorDiego, J. M., AuthorDoré, O., AuthorDouspis, M., AuthorDucout, A., AuthorDupac, X., AuthorDusini, S., AuthorEfstathiou, G., AuthorElsner, F.1, Author              Enßlin, T. A.2, Author              Eriksen, H. K., AuthorFantaye, Y., AuthorFarhang, M., AuthorFergusson, J., AuthorFernandez-Cobos, R., AuthorFinelli, F., AuthorForastieri, F., AuthorFrailis, M., AuthorFraisse, A. A., AuthorFranceschi, E., AuthorFrolov, A., AuthorGaleotta, S., AuthorGalli, S., AuthorGanga, K., AuthorGénova-Santos, R. T., AuthorGerbino, M., AuthorGhosh, T., AuthorGonzález-Nuevo, J., AuthorGórski, K. M., AuthorGratton, S., AuthorGruppuso, A., AuthorGudmundsson, J. E., AuthorHamann, J., AuthorHandley, W., AuthorHansen, F. K., AuthorHerranz, D., AuthorHildebrandt, S. R., AuthorHivon, E., AuthorHuang, Z., AuthorJaffe, A. H. , AuthorJones, W. C., AuthorKarakci, A., AuthorKeihänen, E., AuthorKeskitalo, R., AuthorKiiveri, K., AuthorKim, J.3, Author              Kisner, T. S., AuthorKnox, L., AuthorKrachmalnico, N., AuthorKunz, M., AuthorKurki-Suonio, H., AuthorLagache, G., AuthorLamarre, J.-M., AuthorLasenby, A., AuthorLattanzi, M., AuthorLawrence, C. R., AuthorLe Jeune, M., AuthorLemos, P., AuthorLesgourgues, J., AuthorLevrier, F., AuthorLewis, A., AuthorLiguori, M., AuthorLilje, P. B., AuthorLilley, M., AuthorLindholm, V., AuthorLópez-Caniego, M., AuthorLubin, P. M., AuthorMa, Y.-Z., AuthorMacías-Pérez, J. F., AuthorMaggio, G., AuthorMaino, D., AuthorMandolesi, N., AuthorMangilli, A., AuthorMarcos-Caballero, A., AuthorMaris, M., AuthorMartin, P. G., AuthorMartinelli, M., AuthorMartínez-González, E., AuthorMatarrese, S., AuthorMauri, N., AuthorMcEwen, J. D., AuthorMeinhold, P. R., AuthorMelchiorri, A., AuthorMennella, A., AuthorMigliaccio, M., AuthorMillea, M., AuthorMitra, S., AuthorMiville-Deschênes, M.-A., AuthorMolinari, D., AuthorMontier, L., AuthorMorgante, G., AuthorMoss, A., AuthorNatoli, P., AuthorNørgaard-Nielsen, H. U., AuthorPagano, L., AuthorPaoletti, D., AuthorPartridge, B., AuthorPatanchon, G., AuthorPeiris, H. V., AuthorPerrotta, F., AuthorPettorino, V., AuthorPiacentini, F., AuthorPolastri, L., AuthorPolenta, G., AuthorPuget, J.-L., AuthorRachen, J. P., AuthorReinecke, M.2, Author              Remazeilles, M., AuthorRenzi, A., AuthorRocha, G., AuthorRosset, C., AuthorRoudier, G., AuthorRubiño-Martín, J. A., AuthorRuiz-Granados, B., AuthorSalvati, L., AuthorSandri, M., AuthorSavelainen, M., AuthorScott, D., AuthorShellard, E. P. S., AuthorSirignano, C., AuthorSirri, G., AuthorSpencer, L. D., AuthorSunyaev, R.3, Author              Suur-Uski, A.-S., AuthorTauber, J. A., AuthorTavagnacco, D., AuthorTenti, M., AuthorToffolatti, L. , AuthorTomasi, M., AuthorTrombetti, T., AuthorValenziano, L., AuthorValiviita, J., AuthorTent, B. Van, AuthorVibert, L., AuthorVielva, P., AuthorVilla, F., AuthorVittorio, N., AuthorWandelt, B. D., AuthorWehus, I. K., AuthorWhite, M., AuthorWhite, S. D. M.2, Author              Zacchei, A., AuthorZonca, A., Author more..
Affiliations:
1Cosmology, MPI for Astrophysics, Max Planck Society, ou_159876              
2Computational Structure Formation, MPI for Astrophysics, Max Planck Society, ou_2205642              
3High Energy Astrophysics, MPI for Astrophysics, Max Planck Society, ou_159881              

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 Abstract: We present cosmological parameter results from the final full-mission Planck measurements of the cosmic microwave background (CMB) anisotropies, combining information from the temperature and polarization maps and the lensing reconstruction. Compared to the 2015 results, improved measurements of large-scale polarization allow the reionization optical depth to be measured with higher precision, leading to significant gains in the precision of other correlated parameters. Improved modelling of the small-scale polarization leads to more robust constraints on many parameters, with residual modelling uncertainties estimated to affect them only at the 0.5σ level. We find good consistency with the standard spatially-flat 6-parameter ΛCDM cosmology having a power-law spectrum of adiabatic scalar perturbations (denoted “base ΛCDM” in this paper), from polarization, temperature, and lensing, separately and in combination. A combined analysis gives dark matter density Ωch2 = 0.120 ± 0.001, baryon density Ωbh2 = 0.0224 ± 0.0001, scalar spectral index ns = 0.965 ± 0.004, and optical depth τ = 0.054 ± 0.007 (in this abstract we quote 68% confidence regions on measured parameters and 95% on upper limits). The angular acoustic scale is measured to 0.03% precision, with 100θ* = 1.0411 ± 0.0003. These results are only weakly dependent on the cosmological model and remain stable, with somewhat increased errors, in many commonly considered extensions. Assuming the base-ΛCDM cosmology, the inferred (model-dependent) late-Universe parameters are: Hubble constant H0 = (67.4 ± 0.5)  km s−1 Mpc−1; matter density parameter Ωm = 0.315 ± 0.007; and matter fluctuation amplitude σ8 = 0.811 ± 0.006. We find no compelling evidence for extensions to the base-ΛCDM model. Combining with baryon acoustic oscillation (BAO) measurements (and considering single-parameter extensions) we constrain the effective extra relativistic degrees of freedom to be Neff = 2.99 ± 0.17, in agreement with the Standard Model prediction Neffmeasurements on spatial curvature is consistent with a flat universe, ΩK = 0.001 ± 0.002. Also combining with Type Ia supernovae (SNe), the dark-energy equation of state parameter is measured to be w0 = −1.03 ± 0.03, consistent with a cosmological constant. We find no evidence for deviations from a purely power-law primordial spectrum, and combining with data from BAO, BICEP2, and Keck Array data, we place a limit on the tensor-to-scalar ratio r0.002 <  0.06. Standard big-bang nucleosynthesis predictions for the helium and deuterium abundances for the base-ΛCDM cosmology are in excellent agreement with observations. The Planck base-ΛCDM results are in good agreement with BAO, SNe, and some galaxy lensing observations, but in slight tension with the Dark Energy Survey’s combined-probe results including galaxy clustering (which prefers lower fluctuation amplitudes or matter density parameters), and in significant, 3.6σ, tension with local measurements of the Hubble constant (which prefer a higher value). Simple model extensions that can partially resolve these tensions are not favoured by the Planck data. = 3.046, and find that the neutrino mass is tightly constrained to ∑mν <  0.12  eV. The CMB spectra continue to prefer higher lensing amplitudes than predicted in base ΛCDM at over 2σ, which pulls some parameters that affect the lensing amplitude away from the ΛCDM model; however, this is not supported by the lensing reconstruction or (in models that also change the background geometry) BAO data. (...)

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Language(s): eng - English
 Dates: 2020-09-11
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1051/0004-6361/201833910
Other: LOCALID: 3276710
 Degree: -

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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
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Publ. Info: France : EDP Sciences S A
Pages: - Volume / Issue: 641 Sequence Number: A6 Start / End Page: - Identifier: ISSN: 1432-0746
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1