Simons Observatory: Constraining inflationary gravitational waves with multitracer B -mode delensing
| Autor: | Toshiya Namikawa, Anton Baleato Lizancos, Naomi Robertson, Blake D. Sherwin, Anthony Challinor, David Alonso, Susanna Azzoni, Carlo Baccigalupi, Erminia Calabrese, Julien Carron, Yuji Chinone, Jens Chluba, Gabriele Coppi, Josquin Errard, Giulio Fabbian, Simone Ferraro, Alba Kalaja, Antony Lewis, Mathew S. Madhavacheril, P. Daniel Meerburg, Joel Meyers, Federico Nati, Giorgio Orlando, Davide Poletti, Giuseppe Puglisi, Mathieu Remazeilles, Neelima Sehgal, Osamu Tajima, Grant Teply, Alexander van Engelen, Edward J. Wollack, Zhilei Xu, Byeonghee Yu, Ningfeng Zhu, Andrea Zonca |
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| Přispěvatelé: | AstroParticule et Cosmologie (APC (UMR_7164)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Cosmic Frontier, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Challinor, Anthony [0000-0003-3479-7823], Apollo - University of Cambridge Repository, Namikawa, T, Lizancos, A, Robertson, N, Sherwin, B, Challinor, A, Alonso, D, Azzoni, S, Baccigalupi, C, Calabrese, E, Carron, J, Chinone, Y, Chluba, J, Coppi, G, Errard, J, Fabbian, G, Ferraro, S, Kalaja, A, Lewis, A, Madhavacheril, M, Meerburg, P, Meyers, J, Nati, F, Orlando, G, Poletti, D, Puglisi, G, Remazeilles, M, Sehgal, N, Tajima, O, Teply, G, Van Engelen, A, Wollack, E, Xu, Z, Yu, B, Zhu, N, Zonca, A |
| Rok vydání: | 2022 |
| Předmět: |
noise
Cosmology and Nongalactic Astrophysics (astro-ph.CO) satellite: Planck lens statistical analysis: confidence limit FOS: Physical sciences cosmic background radiation: polarization Astrophysics::Cosmology and Extragalactic Astrophysics Atomic 01 natural sciences Cosmology CMB lensing Particle and Plasma Physics 0103 physical sciences Nuclear structure inflation 010306 general physics Quantum Physics background Settore FIS/05 010308 nuclear & particles physics beam: width gravitational radiation Astrophysics::Instrumentation and Methods for Astrophysics Molecular Nuclear & Particles Physics observatory B-mode atmosphere infrared astro-ph.CO galaxy: density [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] Astronomical and Space Sciences performance Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | Phys.Rev.D Phys.Rev.D, 2022, 105 (2), pp.023511. ⟨10.1103/PhysRevD.105.023511⟩ Physical Review D, vol 105, iss 2 Physical Review D, 105(2):023511. AMER PHYSICAL SOC |
| ISSN: | 2470-0029 2470-0010 0038-5301 0002-7537 |
| Popis: | We introduce and validate a delensing framework for the Simons Observatory (SO), which will be used to improve constraints on inflationary gravitational waves (IGWs) by reducing the lensing noise in measurements of the $B$-modes in CMB polarization. SO will initially observe CMB by using three small aperture telescopes and one large-aperture telescope. While polarization maps from small-aperture telescopes will be used to constrain IGWs, the internal CMB lensing maps used to delens will be reconstructed from data from the large-aperture telescope. Since lensing maps obtained from the SO data will be noise-dominated on sub-degree scales, the SO lensing framework constructs a template for lensing-induced $B$-modes by combining internal CMB lensing maps with maps of the cosmic infrared background from Planck as well as galaxy density maps from the LSST survey. We construct a likelihood for constraining the tensor-to-scalar ratio $r$ that contains auto- and cross-spectra between observed $B$-modes and the lensing $B$-mode template. We test our delensing analysis pipeline on map-based simulations containing survey non-idealities, but that, for this initial exploration, does not include contamination from Galactic and extragalactic foregrounds. We find that the SO survey masking and inhomogeneous and atmospheric noise have very little impact on the delensing performance, and the $r$ constraint becomes $\sigma(r)\approx 0.0015$ which is close to that obtained from the idealized forecasts in the absence of the Galactic foreground and is nearly a factor of two tighter than without delensing. We also find that uncertainties in the external large-scale structure tracers used in our multi-tracer delensing pipeline lead to bias much smaller than the $1\,\sigma$ statistical uncertainties. Comment: 22 pages, 14 figures |
| Databáze: | OpenAIRE |
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