Impact of Galactic dust non-Gaussianity on searches for B-modes from inflation

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dc.contributor.authorAbril-Cabezas, Irene
dc.contributor.authorHervias-Caimapo, Carlos
dc.contributor.authorvon Hausegger, Sebastian
dc.contributor.authorSherwin, Blake D.
dc.contributor.authorAlonso, David
dc.date.accessioned2025-01-20T17:07:46Z
dc.date.available2025-01-20T17:07:46Z
dc.date.issued2024
dc.description.abstractA key challenge in the search for primordial B-modes is the presence of polarized Galactic foregrounds, especially thermal dust emission. Power-spectrum-based analysis methods generally assume the foregrounds to be Gaussian random fields when constructing a likelihood and computing the covariance matrix. In this paper, we investigate how non-Gaussianity in the dust field instead affects CMB and foreground parameter inference in the context of inflationary B-mode searches, capturing this effect via modifications to the dust power-spectrum covariance matrix. For upcoming experiments such as the Simons Observatory, we find no dependence of the tensor-to-scalar ratio uncertainty sigma(r) on the degree of dust non-Gaussianity or the nature of the dust covariance matrix. We provide an explanation of this result, noting that when frequency decorrelation is negligible, dust in mid-frequency channels is cleaned using high-frequency data in a way that is independent of the spatial statistics of dust. We show that our results hold also for non-zero levels of frequency decorrelation that are compatible with existing data. We find, however, that neglecting the impact of dust non-Gaussianity in the covariance matrix can lead to inaccuracies in goodness-of-fit metrics. Care must thus be taken when using such metrics to test B-mode spectra and models, although we show that any such problems can be mitigated by using only cleaned spectrum combinations when computing goodness-of-fit statistics.
dc.fuente.origenWOS
dc.identifier.doi10.1093/mnras/stad3529
dc.identifier.eissn1365-2966
dc.identifier.issn0035-8711
dc.identifier.urihttps://doi.org/10.1093/mnras/stad3529
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/90892
dc.identifier.wosidWOS:001116922000036
dc.issue.numero3
dc.language.isoen
dc.pagina.final5766
dc.pagina.inicio5751
dc.revistaMonthly notices of the royal astronomical society
dc.rightsacceso restringido
dc.subjectmethods: data analysis
dc.subjectcosmic background radiation
dc.subjectcosmological parameters
dc.subjectdiffuse radiation
dc.titleImpact of Galactic dust non-Gaussianity on searches for B-modes from inflation
dc.typeartículo
dc.volumen527
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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