Performance forecasts for the primordial gravitational wave detection pipelines for AliCPT-1

Abstract

AliCPT is the first Chinese cosmic microwave background (CMB) experiment which will make the most precise measurements of the CMB polarization in the northern hemisphere. The key science goal for AliCPT is the detection of primordial gravitational waves (PGWs). It is well known that an epoch of cosmic inflation, in the very early universe, can produce PGWs, which leave an imprint on the CMB in form of odd parity $B$-mode polarization. In this work, we study the performance of the component separation and parameter estimation pipelines in context of constraining the value of the tensor-to-scalar ratio. Based on the simulated data for one observation season, we compare five different pipelines with different working principles. Three pipelines perform component separation at map or spectra level before estimating $r$ from the cleaned spectra, while the other two pipelines performs a global fit for both foreground parameters and $r$. We also test different methods to account for the effects of time stream filtering systematics. This work shows that our pipelines provide consistent and robust constraints on the tensor-to-scalar ratio and a consistent sensitivity $\sigma (r)\sim 0.02$. This showcases the potential of precise $B$-mode polarization measurement with AliCPT-1. AliCPT will provide a powerful opportunity to detect PGWs, which is complementary with various ground-based CMB experiments in the southern hemisphere.

34 pages, 10 figs, 5 tables, JCAP in press

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• Transition Edge Sensors: Physics and Applications
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• Optimization of foreground moment deprojection for semi-blind CMB polarization reconstruction
• Forecasts of CMB lensing reconstruction of AliCPT-1 from the foreground cleaned polarization data
• Forecast of cross-correlation of CSST cosmic shear tomography with AliCPT-1 CMB lensing
• Foreground removal with ILC methods for AliCPT-1
• Forecast of foreground cleaning strategies for AliCPT-1
• Forecast of CMB TB and EB correlations for AliCPT-1
• A Constrained NILC method for CMB B mode observations
• Study on the filters of atmospheric contamination in ground based CMB observation
• The Simons Observatory: Validation of reconstructed power spectra from simulated filtered maps for the Small Aperture Telescope survey
• Challenges in Cosmic Magnification Reconstruction by Magnification Response
• Forecasts of effects of beam systematics and deprojection on the third-generation ground-based cosmic microwave background experiment
• Unbiased Primordial Gravitational Wave Inference from the CMB with SMICA
• Quantum measurement systems and applications to particle physics and cosmology
• Optimal map-making with singularities
• AliCPT Sensitivity to Cosmic Reheating
• Extending the micro-Hertz detection horizons via orbital resonance effect for geocentric gravitational wave antennas
• Forecasts of constraining isotropic cosmic birefringence on AliCPT-1