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  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/26739
Title: On the impact of large angle CMB polarization data on cosmological parameters
Authors: Lattanzi, Massimiliano
BURIGANA, CARLO 
Gerbino, Martina
GRUPPUSO, ALESSANDRO 
Mandolesi, NAZZARENO
Natoli, Paolo
Polenta, Gianluca
SALVATI, LAURA
Trombetti, Tiziana
Issue Date: 2017
Journal: JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS 
Number: 2017
Issue: 2
First Page: 041
Abstract: We study the impact of the large-angle CMB polarization datasets publicly released by the WMAP and Planck satellites on the estimation of cosmological parameters of the ΛCDM model. To complement large-angle polarization, we consider the high resolution (or "high-l") CMB datasets from either WMAP or Planck as well as CMB lensing as traced by Planck's measured four point correlation function. In the case of WMAP, we compute the large-angle polarization likelihood starting over from low resolution frequency maps and their covariance matrices, and perform our own foreground mitigation technique, which includes as a possible alternative Planck 353 GHz data to trace polarized dust. We find that the latter choice induces a downward shift in the optical depth τ, roughly of order 2σ, robust to the choice of the complementary high resolution dataset. When the Planck 353 GHz is consistently used to minimize polarized dust emission, WMAP and Planck 70 GHz large-angle polarization data are in remarkable agreement: by combining them we find τ = 0.066 <SUP>+0.012</SUP><SUB>-0.013</SUB>, again very stable against the particular choice for high-l data. We find that the amplitude of primordial fluctuations A<SUB>s</SUB>, notoriously degenerate with τ, is the parameter second most affected by the assumptions on polarized dust removal, but the other parameters are also affected, typically between 0.5 and 1σ. In particular, cleaning dust with Planck's 353 GHz data imposes a 1σ downward shift in the value of the Hubble constant H<SUB>0</SUB>, significantly contributing to the tension reported between CMB based and direct measurements of the present expansion rate. On the other hand, we find that the appearance of the so-called low l anomaly, a well-known tension between the high- and low-resolution CMB anisotropy amplitude, is not significantly affected by the details of large-angle polarization, or by the particular high-l dataset employed.
URI: http://hdl.handle.net/20.500.12386/26739
URL: https://iopscience.iop.org/article/10.1088/1475-7516/2017/02/041
https://arxiv.org/pdf/1611.01123.pdf
ISSN: 1475-7516
DOI: 10.1088/1475-7516/2017/02/041
Bibcode ADS: 2017JCAP...02..041L
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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lattanzi_etal_JCAP2017.pdf[Administrators only]1.52 MBAdobe PDF
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