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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/8716
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dc.contributor.authorAbril-Cabezas, I-
dc.contributor.authorAdachi, S-
dc.contributor.authorAde, P-
dc.contributor.authorAdler, A E-
dc.contributor.authorAgrawal, P-
dc.contributor.authorAguirre, J-
dc.contributor.authorAiola, S-
dc.contributor.authorAlford, T-
dc.contributor.authorRao, M Sathyanarayana-
dc.contributor.author+ 246 Co-Authors-
dc.date.accessioned2026-05-25T06:15:20Z-
dc.date.available2026-05-25T06:15:20Z-
dc.date.issued2026-04-16-
dc.identifier.citationJournal of Cosmology and Astroparticle Physics, 2026, Vol. 2026(4), AR No. 051en_US
dc.identifier.issn1475-7516-
dc.identifier.urihttp://hdl.handle.net/2289/8716-
dc.descriptionOpen Access. Also available at arXiv.org (one of the alternative locations)en_US
dc.description.abstractWe present updated forecasts for the scientific performance of the degree-scale (0.5 deg FWHM at 93 GHz), deep-field survey to be conducted by the Simons Observatory (SO). By 2027, the SO Small Aperture Telescope (SAT) complement will be doubled from three to six telescopes, including a doubling of the detector count in the 93 GHz and 145 GHz channels to 48,160 detectors. Combined with a planned extension of the survey duration to 2035, this expansion will significantly enhance SO's search for a B-mode signal in the polarisation of the cosmic microwave background, a potential signature of gravitational waves produced in the very early Universe. Assuming a 1/f noise model with knee multipole ℓknee = 50 and a moderately complex model for Galactic foregrounds, we forecast a 1σ (or 68% confidence level) constraint on the tensor-to-scalar ratio r of σr = 1.2 × 10-3, assuming no primordial B-modes are present. This forecast assumes that 70% of the B-mode lensing signal can ultimately be removed using high resolution observations from the SO Large Aperture Telescope (LAT) and overlapping large-scale structure surveys. For more optimistic assumptions regarding foregrounds and noise, and assuming the same level of delensing, this forecast constraint improves to σr = 7 × 10-4. These forecasts represent a major improvement in SO's constraining power, being a factor of around 2.5 times better than what could be achieved with the originally planned campaign, which assumed the existing three SATs would conduct a five-year survey.en_US
dc.language.isoenen_US
dc.publisherJournal of Cosmology and Astroparticle Physicsen_US
dc.relation.urihttps://doi.org/10.48550/arXiv.2512.15833en_US
dc.relation.urihttp://doi.org/10.1088/1475-7516/2026/04/051en_US
dc.rights© 2026 The Author(s)en_US
dc.subjectCMBR experimentsen_US
dc.subjectcosmological parameters from CMBRen_US
dc.subjectgravitational wavesen_US
dc.subjectCMBR polarizationen_US
dc.titleThe Simons Observatory: forecasted constraints on primordial gravitational waves with the expanded array of Small Aperture Telescopesen_US
dc.typeArticleen_US
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