PROSPECTS for DELENSING the COSMIC MICROWAVE BACKGROUND for STUDYING INFLATION

Gabrielle Simard, Duncan Hanson, Gil Holder

Research output: Contribution to journalArticlepeer-review

Abstract

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 nT. 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 Δp = 1 μK arcmin. At this sensitivity level, CMB delensing will be able to measure nT 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 nT in simple inflationary models.

Original languageEnglish (US)
Article number166
JournalAstrophysical Journal
Volume807
Issue number2
DOIs
StatePublished - Jul 10 2015
Externally publishedYes

Keywords

  • cosmic background radiation
  • inflation

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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