Journal
ASTROPHYSICAL JOURNAL
Volume 807, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/807/2/166
Keywords
cosmic background radiation; inflation
Categories
Funding
- Canadian Institute for Advanced Research
- National Sciences and Engineering Research Council of Canada
- Canada Research Chairs program
- Lorne Trottier Chair in Astrophysics and Cosmology at McGill
- CITA National Fellowship
- Fonds de recherche du Quebec-Nature et technologies
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A detection of excess cosmic microwave background (CMB) B-mode polarization on large scales allows the possibility of measuring not only the amplitude of these fluctuations but also their scale dependence, which can be parametrized as the tensor tilt n(T). Measurements of this scale dependence will be hindered by the secondary B-mode polarization anisotropy induced by gravitational lensing. Fortunately, these contaminating B modes can be estimated and removed with a sufficiently good estimate of the intervening gravitational potential and a good map of CMB E-mode polarization. We present forecasts for how well these gravitational lensing B modes can be removed, assuming that the lensing potential can be estimated either internally from CMB data or using maps of the cosmic infrared background (CIB) as a tracer. We find that CIB maps are as effective as CMB maps for delensing at the noise levels of the current generation of CMB experiments, while the CMB maps themselves will ultimately be best for delensing at polarization noise below Delta(P) = 1 mu K arcmin. At this sensitivity level, CMB delensing will be able to measure n(T) to an accuracy of 0.02 or better, which corresponds to the tensor tilt predicted by the consistency relation for single-field slow-roll models of inflation with r = 0.2. However, CIB-based delensing will not be sufficient for constraining n(T) in simple inflationary models.
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