Wedge-avoidance Fisher Forecasts for Primordial Non-Gaussianity from Dark-Ages 21-cm Power Spectrum and Bispectrum

arXiv:2606.23314 · astro-ph.CO · Submitted 2026-06-22 · Read on arXiv

Chen Zhang, Furen Deng, Yidong Xu, Bin Yue, Yuewei Wen, Xuelei Chen

astro-ph.CO

Submitted: 2026-06-22

Comments: 28 pages, 15 figures

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Terminology

• Bispectrum — 95× in this paper · explained in 3 episodes
• Non-Gaussianity — 23× in this paper · explained in 2 episodes
• 21-cm Power Spectrum — 21× in this paper · explained in 1 episode
• Primordial non-Gaussianity — 19× in this paper · explained in 2 episodes
• 21-cm signal — 11× in this paper · explained in 1 episode
• Fisher Information — 4× in this paper · explained in 3 episodes
• 21-cm intensity mapping — 3× in this paper · explained in 2 episodes
• Core — 2× in this paper · explained in 2 episodes
• Matter Power Spectrum — 2× in this paper · explained in 2 episodes
• Signal-to-noise ratio (SNR) — 2× in this paper · explained in 2 episodes
• Adam — 1× in this paper · explained in 2 episodes
• Consistency — 1× in this paper · explained in 3 episodes
• Cooperation — 1× in this paper · explained in 2 episodes
• Fisher matrix formalism — 1× in this paper · explained in 2 episodes
• Trace — 1× in this paper · explained in 2 episodes

Sources

• Review of local non-Gaussianity from multi-field inflation
• Planck 2018 results. IX. Constraints on primordial non-Gaussianity
• Updating constraints on inflationary features in the primordial power spectrum with the Planck data
• Primordial features and Planck polarization
• Signals from the early Universe: a comprehensive search for primordial features in Planck CMB datasets
• Testing Inflation with Large Scale Structure: Connecting Hopes with Reality
• Constraining primordial non-Gaussianity with DESI 2024 LRG and QSO samples
• 21-cm cosmology
• The Dark Ages' 21-cm Trispectrum
• Prospects for precision cosmology with the 21 cm signal from the dark ages
• Testing the growth of cosmic structures during the Dark Ages
• Detecting the 21 cm Signal of the Cosmic Dark Ages
• How accurately can 21 cm tomography constrain cosmology?
• The limits of cosmology: role of the Moon
• Probing primordial non-Gaussianity with SKA galaxy redshift surveys: a fully relativistic analysis
• Forecasts on Primordial non-Gaussianity from 21 cm Intensity Mapping experiments
• Large-scale Array for Radio Astronomy on the Farside
• FarView: An In-Situ Manufactured Lunar Far Side Radio Array Concept for 21-cm Dark Ages Cosmology
• Precise measurements of inflationary features with 21 cm observations
• Euclid preparation: Expected constraints on initial conditions

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