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arXiv 1608.02487astro-ph.CO
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普朗克中间结果。LI。宇宙微波背景温度功率谱的特征和宇宙学参数的变化

Planck intermediate results. LI. Features in the cosmic microwave background temperature power spectrum and shifts in cosmological parameters

Planck Collaboration, N. Aghanim, Y. Akrami, M. Ashdown, J. Aumont, M. Ballardini, A. J. Banday, R. B. Barreiro, N. Bartolo, S. Basak, K. Benabed, M. Bersanelli… 展开作者

Planck Collaboration, N. Aghanim, Y. Akrami, M. Ashdown, J. Aumont, M. Ballardini, A. J. Banday, R. B. Barreiro, N. Bartolo, S. Basak, K. Benabed, M. Bersanelli, P. Bielewicz, A. Bonaldi, L. Bonavera, J. R. Bond, J. Borrill, F. R. Bouchet, C. Burigana, E. Calabrese, J. -F. Cardoso, A. Challinor, H. C. Chiang, L. P. L. Colombo, C. Combet, B. P. Crill, A. Curto, F. Cuttaia, P. de Bernardis, A. de Rosa, G. de Zotti, J. Delabrouille, E. Di Valentino, C. Dickinson, J. M. Diego, O. Doré, A. Ducout, X. Dupac, S. Dusini, G. Efstathiou, F. Elsner, T. A. Enßlin, H. K. Eriksen, Y. Fantaye, F. Finelli, F. Forastieri, M. Frailis, E. Franceschi, A. Frolov, S. Galeotta, S. Galli, K. Ganga, R. T. Génova-Santos, M. Gerbino, J. González-Nuevo, K. M. Górski, A. Gruppuso, J. E. Gudmundsson, D. Herranz, E. Hivon, Z. Huang, A. H. Jaffe, W. C. Jones, E. Keihänen, R. Keskitalo, K. Kiiveri, J. Kim, T. S. Kisner, L. Knox, N. Krachmalnicoff, M. Kunz, H. Kurki-Suonio, G. Lagache, J. -M. Lamarre, A. Lasenby, M. Lattanzi, C. R. Lawrence, M. Le Jeune, F. Levrier, A. Lewis, P. B. Lilje, M. Lilley, V. Lindholm, M. López-Caniego, P. M. Lubin, Y. -Z. Ma, J. F. Macías-Pérez, G. Maggio, D. Maino, N. Mandolesi, A. Mangilli, M. Maris, P. G. Martin, E. Martínez-González, S. Matarrese, N. Mauri, J. D. McEwen, P. R. Meinhold, A. Mennella, M. Migliaccio, M. Millea, M. -A. Miville-Deschênes, D. Molinari, A. Moneti, L. Montier, G. Morgante, A. Moss, A. Narimani, P. Natoli, C. A. Oxborrow, L. Pagano, D. Paoletti, G. Patanchon, L. Patrizii, V. Pettorino, F. Piacentini, L. Polastri, G. Polenta, J. -L. Puget, J. P. Rachen, B. Racine, M. Reinecke, M. Remazeilles, A. Renzi, M. Rossetti, G. Roudier, J. A. Rubiño-Martín, B. Ruiz-Granados, L. Salvati, M. Sandri, M. Savelainen, D. Scott, C. Sirignano, G. Sirri, L. Stanco, A. -S. Suur-Uski, J. A. Tauber, D. Tavagnacco, M. Tenti, L. Toffolatti, M. Tomasi, M. Tristram, T. Trombetti, J. Valiviita, F. Van Tent, P. Vielva, F. Villa, N. Vittorio, B. D. Wandelt, I. K. Wehus, M. White, A. Zacchei, A. Zonca

摘要:

标准$Λ$ CDM模型的六个参数具有来自普朗克温度功率谱的最佳拟合值,这些最佳拟合值与来自WMAP数据的最佳拟合值略有偏移。这些变化是由普朗克温度功率谱在角度尺度上的特征驱动的,这些特征以前从未被测量到宇宙方差水平的精度。我们调查这些变化,以确定它们是否在预期范围内,并了解它们在数据中的起源。取重电离星系际介质$τ$的光学厚度、重子密度$ω_{\rm b}$、物质密度$ω_{\rm m}$、声视界角尺寸$θ_*$、原初功率谱的谱指数$n_{\rm s}$和$A_{\rm s}e^{-2τ}$为参数集(其中$A_{\rm s}$是原始功率谱的幅度),我们研究了一个类似WMAP的大角度尺度数据集之间最佳拟合值的变化(在普朗克温度功率谱中具有多极矩$\ell<800$)和全角度尺度数据集($\ell<2500$普朗克温度功率谱),每个都具有$0.07\pm0.02$的$τ$的先验。我们发现,移位,在单位的1 PDMATHAMBMX预期分散的每个参数,是$\{Δτ, ΔA_{\rm s} e^{-2τ}, Δn_{\rm s}, Δω_{\rm m}, Δω_{\rm b}, Δθ_*\} = \{-1.7, -2.2, 1.2, -2.0, 1.1, 0.9\}$,与PDMATHAMBMZ值为8.0。我们发现,这个$χ^2$值超过了我们的模拟数据集的15%,并在9%的模拟数据集的参数偏差超过2.2 $σ$,这意味着移动并不异常大。比较$\ell<800$而不是$\ell>800$,或在不同的多极分裂,产生类似的结果。我们检查$\ell<800$模型残差中的$\ell>800$功率谱数据,发现那里的功能…[删节]

英文摘要:

The six parameters of the standard $Λ$CDM model have best-fit values derived from the Planck temperature power spectrum that are shifted somewhat from the best-fit values derived from WMAP data. These shifts are driven by features in the Planck temperature power spectrum at angular scales that had never before been measured to cosmic-variance level precision. We investigate these shifts to determine whether they are within the range of expectation and to understand their origin in the data. Taking our parameter set to be the optical depth of the reionized intergalactic medium $τ$, the baryon density $ω_{\rm b}$, the matter density $ω_{\rm m}$, the angular size of the sound horizon $θ_*$, the spectral index of the primordial power spectrum, $n_{\rm s}$, and $A_{\rm s}e^{-2τ}$ (where $A_{\rm s}$ is the amplitude of the primordial power spectrum), we examine the change in best-fit values between a WMAP-like large angular-scale data set (with multipole moment $\ell<800$ in the Planck temperature power spectrum) and an all angular-scale data set ($\ell<2500$ Planck temperature power spectrum), each with a prior on $τ$ of $0.07\pm0.02$. We find that the shifts, in units of the 1$σ$ expected dispersion for each parameter, are $\{Δτ, ΔA_{\rm s} e^{-2τ}, Δn_{\rm s}, Δω_{\rm m}, Δω_{\rm b}, Δθ_*\} = \{-1.7, -2.2, 1.2, -2.0, 1.1, 0.9\}$, with a $χ^2$ value of 8.0. We find that this $χ^2$ value is exceeded in 15% of our simulated data sets, and that a parameter deviates by more than 2.2$σ$ in 9% of simulated data sets, meaning that the shifts are not unusually large. Comparing $\ell<800$ instead to $\ell>800$, or splitting at a different multipole, yields similar results. We examine the $\ell<800$ model residuals in the $\ell>800$ power spectrum data and find that the features there... [abridged]

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