The Simons Observatory: component separation pipelines for B-modes
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arXiv
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| Auteurs principaux: | , , , , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866917716562018304 |
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| author | Wolz, Kevin Azzoni, Susanna Hervías-Caimapo, Carlos Errard, Josquin Krachmalnicoff, Nicoletta Alonso, David Beringue, Benjamin Hertig, Emilie |
| author_facet | Wolz, Kevin Azzoni, Susanna Hervías-Caimapo, Carlos Errard, Josquin Krachmalnicoff, Nicoletta Alonso, David Beringue, Benjamin Hertig, Emilie |
| contents | The upcoming Simons Observatory (SO) Small Aperture Telescopes aim at observing the degree-scale anisotropies of the polarized CMB to constrain the primordial tensor-to-scalar ratio $r$ at the level of $σ(r=0)\lesssim0.003$ to probe models of the very early Universe. We present three complementary $r$ inference pipelines and compare their results on a set of sky simulations that allow us to explore a number of Galactic foreground and instrumental noise models, relevant for SO. In most scenarios, the pipelines retrieve consistent and unbiased results. However, several complex foreground scenarios lead to a $>2σ$ bias on $r$ if analyzed with the default versions of these pipelines, highlighting the need for more sophisticated pipeline components that marginalize over foreground residuals. We present two such extensions, using power-spectrum-based and map-based methods, and show that they fully reduce the bias on $r$ to sub-sigma level in all scenarios, and at a moderate cost in terms of $σ(r)$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_06891 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The Simons Observatory: component separation pipelines for B-modes Wolz, Kevin Azzoni, Susanna Hervías-Caimapo, Carlos Errard, Josquin Krachmalnicoff, Nicoletta Alonso, David Beringue, Benjamin Hertig, Emilie Cosmology and Nongalactic Astrophysics The upcoming Simons Observatory (SO) Small Aperture Telescopes aim at observing the degree-scale anisotropies of the polarized CMB to constrain the primordial tensor-to-scalar ratio $r$ at the level of $σ(r=0)\lesssim0.003$ to probe models of the very early Universe. We present three complementary $r$ inference pipelines and compare their results on a set of sky simulations that allow us to explore a number of Galactic foreground and instrumental noise models, relevant for SO. In most scenarios, the pipelines retrieve consistent and unbiased results. However, several complex foreground scenarios lead to a $>2σ$ bias on $r$ if analyzed with the default versions of these pipelines, highlighting the need for more sophisticated pipeline components that marginalize over foreground residuals. We present two such extensions, using power-spectrum-based and map-based methods, and show that they fully reduce the bias on $r$ to sub-sigma level in all scenarios, and at a moderate cost in terms of $σ(r)$. |
| title | The Simons Observatory: component separation pipelines for B-modes |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2407.06891 |