Simulated forecasts for primordial B -mode searches in ground-based experiments

David Alonso, Joanna Dunkley, Ben Thorne, Sigurd Næss

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


Detecting the imprint of inflationary gravitational waves on the B-mode polarization of the cosmic microwave background (CMB) is one of the main science cases for current and next-generation CMB experiments. In this work we explore some of the challenges that ground-based facilities will have to face in order to carry out this measurement in the presence of galactic foregrounds and correlated atmospheric noise. We present forecasts for stage-3 (S3) and planned stage-4 (S4) experiments based on the analysis of simulated sky maps using a map-based Bayesian foreground-cleaning method. Our results thus consistently propagate the uncertainties on foreground parameters such as spatially varying spectral indices, as well as the bias on the measured tensor-to-scalar ratio r caused by an incorrect modeling of the foregrounds. We find that S3 and S4-like experiments should be able to put constraints on r of the order σ(r)=(0.5-1.0)×10-2 and σ(r)=(0.5-1.0)×10-3 respectively, assuming instrumental systematic effects are under control. We further study deviations from the fiducial foreground model, finding that, while the effects of a second polarized dust component would be minimal on both S3 and S4, a 2% polarized anomalous dust emission component would be clearly detectable by stage-4 experiments.

Original languageEnglish (US)
Article number043504
JournalPhysical Review D
Issue number4
StatePublished - Feb 7 2017
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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