Precision of future experiments measuring primordial tensor fluctuation

Abstract

Recently the second phase of Background Imaging of Cosmic Extragalactic Polarization (BICEP2) claimed a detection of the tensor-to-scalar ratio ($r$) of primordial fluctuation at $5\sigma$ confidence level. If it is true, this large and measurable amplitude ($r\simeq 0.2$) of B-mode polarization indicates that it is possible to measure the shape of CMB B-mode polarization with future experiments. We forecast the precision of $r$ and the tensor spectral index $n_{\mathrm{t}}$ measurements, with $n_{\mathrm{t}}$ as a free parameter, from a {\it Planck}-like experiment, and from Spider and POLARBEAR given the current understanding of their experimental noise and foreground contamination. We quantitatively determine the signal-to-noise of the measurement in $r$-$n_{\mathrm{t}}$ parameter space for the three experiments. The forecasted signal-to-noise ratio of the B-mode polarization somewhat depends on $n_{\mathrm{t}}$, but strongly depends on the true value of $r$.

6 pages, 6 figures, revised version

References in corpus (19)

• Efficient Computation of CMB anisotropies in closed FRW models
• Cosmological parameters from CMB and other data: a Monte-Carlo approach
• BICEP2 I: Detection Of B-mode Polarization at Degree Angular Scales
• Karhunen-Loeve eigenvalue problems in cosmology: how should we tackle large data sets?
• The Cold Dark Matter Density Perturbation
• Measuring cosmological parameters with galaxy surveys
• A Measurement of the Cosmic Microwave Background B-Mode Polarization Power Spectrum at Sub-Degree Scales with POLARBEAR
• Toward an Understanding of Foreground Emission in the BICEP2 Region
• Gravitational lensing as a contaminant of the gravity wave signal in CMB
• Exploring Bouncing Cosmologies with Cosmological Surveys
• Non-Bunch-Davies Initial State Reconciles Chaotic Models with BICEP and Planck
• Evidence for bouncing evolution before inflation after BICEP2
• Testing quantum gravity effects with latest CMB observations
• On quantifying and resolving the BICEP2/Planck tension over gravitational waves
• Blue Gravity Waves from BICEP2 ?
• Constraints on standard and non-standard early Universe models from CMB B-mode polarization
• Pre-inflationary genesis with CMB B-mode polarization
• Reconstructing the Local Potential of Inflation with BICEP2 data
• Global fitting analysis on cosmological models after BICEP2

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