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

Author(s): Alonso, David; Dunkley, Jo; Thorne, Ben; Næss, Sigurd

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Abstract: 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 ð r Þ¼ ð 0 . 5 – 1 . 0 Þ × 10 − 2 and σ ð r Þ¼ð 0 . 5 – 1 . 0 Þ × 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.
Publication Date: 15-Feb-2017
Electronic Publication Date: 7-Feb-2017
Citation: Alonso, David, Dunkley, Joanna, Thorne, Ben, Næss, Sigurd. (2017). Simulated forecasts for primordial -mode searches in ground-based experiments. Physical Review D, 95 (4), 10.1103/PhysRevD.95.043504
DOI: doi:10.1103/PhysRevD.95.043504
ISSN: 2470-0010
EISSN: 2470-0029
Pages: 043504-1 - 043504-20
Type of Material: Journal Article
Journal/Proceeding Title: Physical Review D
Version: Author's manuscript

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