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Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2017

Cosmology with the cosmic microwave background temperature-polarization correlation

Résumé

We demonstrate that the cosmic microwave background (CMB) temperature-polarization cross-correlation provides accurate and robust constraints on cosmological parameters. We compare them with the results from temperature or polarization and investigate the impact of foregrounds, cosmic variance, and instrumental noise. This analysis makes use of the Planck high-ℓ HiLLiPOP likelihood based on angular power spectra, which takes into account systematics from the instrument and foreground residuals directly modelled using Planck measurements. The temperature-polarization correlation (TE) spectrum is less contaminated by astrophysical emissions than the temperature power spectrum (TT), allowing constraints that are less sensitive to foreground uncertainties to be derived. For ΛCDM parameters, TE gives very competitive results compared to TT. For basic ΛCDM model extensions (such as AL, ∑mν, or Neff), it is still limited by the instrumental noise level in the polarization maps. Key words: cosmic background radiation / cosmological parameters / methods: data analysis
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Dates et versions

hal-01554767 , version 1 (04-11-2020)

Identifiants

Citer

F. Couchot, S. Henrot-Versillé, O. Perdereau, S. Plaszczynski, B. Rouillé d'Orfeuil, et al.. Cosmology with the cosmic microwave background temperature-polarization correlation. Astronomy and Astrophysics - A&A, 2017, 602, pp.A41. ⟨10.1051/0004-6361/201629815⟩. ⟨hal-01554767⟩
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