Inflation and Early Dark Energy with a Stage II Hydrogen Intensity Mapping Experiment

Abstract

This white paper envisions a revolutionary post-DESI, post-LSST dark energy program based on intensity mapping of the redshifted 21cm emission line from neutral hydrogen at radio frequencies. The proposed intensity mapping survey has the unique capability to quadruple the volume of the Universe surveyed by optical programs, provide a percent-level measurement of the expansion history to $z\sim 6$, open a window to explore physics beyond the concordance $\Lambda$CDM model, and to significantly improve the precision on standard cosmological parameters. In addition, characterization of dark energy and new physics will be powerfully enhanced by cross-correlations with optical surveys and cosmic microwave background measurements. The rich dataset obtained by the proposed intensity mapping instrument will be simultaneously useful in exploring the time-domain physics of fast radio transients and pulsars, potentially in live "multi-messenger" coincidence with other observatories. The core dark energy/inflation science advances enabled by this program are the following: (i) Measure the expansion history of the universe over $z=0.3-6$ with a single instrument, extending the range deep into the pre-acceleration era, providing an unexplored window for new physics; (ii) Measure the growth rate of structure in the universe over the same redshift range; (iii) Observe, or constrain, the presence of inflationary relics in the primordial power spectrum, improving existing constraints by an order of magnitude; (iv) Observe, or constrain, primordial non-Gaussianity with unprecedented precision, improving constraints on several key numbers by an order of magnitude. Detailed mapping of the enormous, and still largely unexplored, volume of cosmic space will thus provide unprecedented information on fundamental questions of the vacuum energy and early-universe physics.

arXiv commentThis white-paper was prepared under auspices of the Department of Energy Cosmic Visions Dark Energy program; v1: initial release in Oct 2018; v2: Jul 2019 update: strawman design matches PUMA Decadal Submission, updated forecasting, new figures and science section; v3: fixed reference, missing author in metadata

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Cited by in corpus (42)

• A Standard Ruler at Cosmic Dawn
• Scratches from the Past: Inflationary Archaeology through Features in the Power Spectrum of Primordial Fluctuations
• Redundant-Baseline Calibration of the Hydrogen Epoch of Reionization Array
• Multi-tracer intensity mapping: Cross-correlations, Line noise & Decorrelation
• Forecasts on Primordial non-Gaussianity from 21 cm Intensity Mapping experiments
• The Tianlai Dish Pathfinder Array: design, operation and performance of a prototype transit radio interferometer
• Baryonic effects on the matter bispectrum
• Game of cones: A nulling strategy for modelling lensing convergence in cones with large deviation theory
• Wave effects in the microlensing of pulsars and FRBs by point masses
• Primordial Non-Gaussianity
• Intensity mapping with neutral hydrogen and the Hidden Valley simulations
• HIGAN: Cosmic Neutral Hydrogen with Generative Adversarial Networks
• Detecting the relativistic bispectrum in 21cm intensity maps
• Cosmological constraints from the power spectrum and bispectrum of 21cm intensity maps
• Light Fields during Inflation from BOSS and Future Galaxy Surveys
• Prospects for measuring dark energy with 21 cm intensity mapping experiments
• Cross-correlating 21 cm and galaxy surveys: implications for cosmology and astrophysics
• Searching for Gravitational Waves with Strongly Lensed Repeating Fast Radio Bursts
• Density reconstruction from biased tracers and its application to primordial non-Gaussianity
• Study of warm inflationary models and their parameter estimation from CMB
• Beyond $\Lambda$CDM with HI intensity mapping: robustness of cosmological constraints in the presence of astrophysics
• The Cross-correlation of KSZ Effect and 21 cm Intensity Mapping with Tidal Reconstruction
• Cosmological Probes of Structure Growth and Tests of Gravity
• Packed Ultra-wideband Mapping Array (PUMA): Astro2020 RFI Response
• Physics Beyond The Standard Model with Circular Polarization in the CMB and CMB-21cm Cross-Correlation
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• Wide-angle effects in the galaxy bispectrum
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• Searching for dark energy in the matter-dominated era
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• Mapping the Universe in HD
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• Cosmology at high redshift -- a probe of fundamental physics
• Cosmological constraints from the EFT power spectrum and tree-level bispectrum of 21cm intensity maps
• Bispectrum constraints on Primordial non-Gaussianities with the eBOSS DR16 quasars
• A wide-angle formulation of foreground filters for HI intensity mapping
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