Impact of reionization on CMB polarization tests of slow-roll inflation

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dc.creatorMortonson, Michael J.
dc.creatorHu, Wayne
dc.date2007-10-23
dc.date.accessioned2026-07-07T11:12:30Z
dc.date.available2026-07-07T11:12:30Z
dc.descriptionEstimates of inflationary parameters from the CMB B-mode polarization spectrum on the largest scales depend on knowledge of the reionization history, especially at low tensor-to-scalar ratio. Assuming an incorrect reionization history in the analysis of such polarization data can strongly bias the inflationary parameters. One consequence is that the single-field slow-roll consistency relation between the tensor-to-scalar ratio and tensor tilt might be excluded with high significance even if this relation holds in reality. We explain the origin of the bias and present case studies with various tensor amplitudes and noise characteristics. A more model-independent approach can account for uncertainties about reionization, and we show that parametrizing the reionization history by a set of its principal components with respect to E-mode polarization removes the bias in inflationary parameter measurement with little degradation in precision.
dc.description9 pages, 6 figures; submitted to Phys. Rev. D
dc.identifierhttps://arxiv.org/abs/0710.4162
dc.identifierhttp://arxiv.org/abs/0710.4162
dc.identifierPhys.Rev.D77:043506,2008
dc.identifierdoi:10.1103/PhysRevD.77.043506
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/191402
dc.subjectAstrophysics
dc.titleImpact of reionization on CMB polarization tests of slow-roll inflation
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