The Simons Observatory: Combining delensing and foreground cleaning for improved constraints on inflation
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866917672680161280 |
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| author | Hertig, Emilie Wolz, Kevin Namikawa, Toshiya Lizancos, Antón Baleato Azzoni, Susanna Challinor, Anthony |
| author_facet | Hertig, Emilie Wolz, Kevin Namikawa, Toshiya Lizancos, Antón Baleato Azzoni, Susanna Challinor, Anthony |
| contents | The Simons Observatory (SO), a next-generation ground-based CMB experiment in its final stages of construction, will target primordial $B$-modes with unprecedented sensitivity to set tight bounds on the amplitude of inflationary gravitational waves. Aiming to infer the tensor-to-scalar ratio $r$ with precision $σ(r=0) \leq 0.003$, SO will rely on powerful component-separation algorithms to distinguish the faint primordial signal from stronger sources of large-scale $B$-modes such as Galactic foregrounds and weak gravitational lensing. We present an analysis pipeline that performs delensing and foreground cleaning simultaneously by including multifrequency CMB data and a lensing $B$-mode template in a power-spectrum-based likelihood. Here, we demonstrate this algorithm on masked SO-like simulations containing inhomogeneous noise and non-Gaussian foregrounds. The lensing convergence is reconstructed from high-resolution simulations of the CMB and external mass tracers. Using optimized pixel weights for power spectrum estimation, the target precision for SO's nominal design is achieved and delensing reduces $σ(r)$ by 27-37%, depending on foreground complexity. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2405_13201 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The Simons Observatory: Combining delensing and foreground cleaning for improved constraints on inflation Hertig, Emilie Wolz, Kevin Namikawa, Toshiya Lizancos, Antón Baleato Azzoni, Susanna Challinor, Anthony Cosmology and Nongalactic Astrophysics The Simons Observatory (SO), a next-generation ground-based CMB experiment in its final stages of construction, will target primordial $B$-modes with unprecedented sensitivity to set tight bounds on the amplitude of inflationary gravitational waves. Aiming to infer the tensor-to-scalar ratio $r$ with precision $σ(r=0) \leq 0.003$, SO will rely on powerful component-separation algorithms to distinguish the faint primordial signal from stronger sources of large-scale $B$-modes such as Galactic foregrounds and weak gravitational lensing. We present an analysis pipeline that performs delensing and foreground cleaning simultaneously by including multifrequency CMB data and a lensing $B$-mode template in a power-spectrum-based likelihood. Here, we demonstrate this algorithm on masked SO-like simulations containing inhomogeneous noise and non-Gaussian foregrounds. The lensing convergence is reconstructed from high-resolution simulations of the CMB and external mass tracers. Using optimized pixel weights for power spectrum estimation, the target precision for SO's nominal design is achieved and delensing reduces $σ(r)$ by 27-37%, depending on foreground complexity. |
| title | The Simons Observatory: Combining delensing and foreground cleaning for improved constraints on inflation |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2405.13201 |