Precise measurements of inflationary features with 21 cm observations

Abstract

Future observations of 21~cm emission using HI intensity mapping will enable us to probe the large scale structure of the Universe over very large survey volumes within a reasonable observation time. We demonstrate that the three-dimensional information contained in such surveys will be an extremely powerful tool in searching for features that were imprinted in the primordial power spectrum and bispectrum during inflation. Here we focus on the "resonant" and "step" inflation models, and forecast the potential of upcoming 21~cm experiments to detect these inflationary features in the observable power- and bispectrum. We find that the full scale Tianlai experiment and the Square Kilometre Array (SKA) have the potential to improve on the sensitivity of current Cosmic Microwave Background (CMB) experiments by several orders of magnitude.

7 pages, 3 figures, replaced with revised version

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• Studying high-z galaxies with [CII] intensity mapping
• Primordial Standard Clock Models and CMB Residual Anomalies
• Euclid: The search for primordial features
• Prospects for measuring dark energy with 21 cm intensity mapping experiments: A joint survey strategy
• Back to the features: assessing the discriminating power of future CMB missions on inflationary models
• Optimising Inflationary Features the Bayesian Way
• Understanding large scale CMB anomalies with the generalized non-minimal derivative coupling during inflation
• Investigating the Origin of CMB Large-Scale Features Using LiteBIRD and CMB-S4
• Refining the nonlinear modelling of primordial oscillatory features
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• Measurement of the Primary Beam of the Tianlai Cylindrical Antenna Using an Unmanned Aerial Vehicle
• An Overview of CHIME, the Canadian Hydrogen Intensity Mapping Experiment
• Consistency of Planck Data With Power-Law Primordial Scalar Power Spectrum
• Investigating the Constraints on Primordial Features with Future Cosmic Microwave Background and Galaxy Surveys
• The Effects of the Local Environment on a Compact Radio Interferometer I: Cross-coupling in the Tianlai Dish Pathfinder Array
• Particle production during inflation: A Bayesian analysis with CMB data from Planck 2018