Observing nulling of primordial correlations via the 21 cm signal

Abstract

The 21cm line emitted by neutral hydrogen (HI) during the Dark Ages carries imprints of pristine primordial correlations. In models of inflation driven by a single, canonical scalar field, we show that a phase of ultra-slow-roll can lead to a null in all the primordial correlations at a specific wavenumber $k_{\text{dip}}$. We consider scenarios wherein the null in the correlations occurs over wavenumbers $1\lesssim k_{\text{dip}}\lesssim 10{\mathrm{Mpc}}^{-1}$, and examine the prospects of detecting such a damping in the HI signal due to the nulls at the level of power and bi-spectra in future observational missions.

arXiv commentv1: 10 pages, 5 figures; v2: 11 pages, 5 figures including supplementary material, published in Phys. Rev. Lett

References in corpus (48)

• Non-Gaussian features of primordial fluctuations in single field inflationary models
• Encyclopaedia Inflationaris
• 21-cm cosmology
• Primordial Non-Gaussianities from Inflation Models
• Primordial black holes from single field models of inflation
• Reionization and Cosmology with 21 cm Fluctuations
• Primordial non-gaussianities in single field inflation
• Horizon crossing and inflation with large η
• Primordial black hole dark matter from single field inflation
• The Evolution of the Intergalactic Medium
• Steepest growth of the power spectrum and primordial black holes
• The Best Inflationary Models After Planck
• Primordial Black Hole production in Critical Higgs Inflation
• Single Field Double Inflation and Primordial Black Holes
• Primordial Black Holes as Generators of Cosmic Structures
• Primordial Black Holes as Dark Matter: The Power Spectrum and Evaporation of Early Structures
• The Phase II Murchison Widefield Array: Design Overview
• Gravitational waves at interferometer scales and primordial black holes in axion inflation
• Primordial Black Holes from $\alpha$-attractors
• Formation of supermassive black hole seeds
• PBHs and secondary GWs from ultra slow roll and punctuated inflation
• The Cosmic Dawn and Epoch of Reionization with the Square Kilometre Array
• Improved Estimates of Cosmological Perturbations
• Redshifted 21 cm Emission From the Pre-Reionization Era I. Mean Signal and Linear Fluctuations
• The Effects of Dark Matter Decay and Annihilation on the High-Redshift 21 cm Background
• The power spectrum on small scales: Robust constraints and comparing PBH methodologies
• On the robustness of the primordial power spectrum in renormalized Higgs inflation
• BINGO: A code for the efficient computation of the scalar bi-spectrum
• An analytic approach to non-slow-roll inflation
• A note on the role of the boundary terms for the non-Gaussianity in general k-inflation
• Towards a measurement of the spectral runnings
• The scalar bi-spectrum in the Starobinsky model: The equilateral case
• Revisiting small-scale fluctuations in $\alpha$-attractor models of inflation
• Overshooting, Critical Higgs Inflation and Second Order Gravitational Wave Signatures
• HI Signal from Reionization Epoch
• Accounting for scalar non-Gaussianity in secondary gravitational waves
• Induced gravitational waves from the cosmic coincidence
• Induced gravitational waves from slow-roll inflation after an enhancing phase
• Strong scale dependent bispectrum in the Starobinsky model of inflation
• Consistency conditions and primordial black holes in single field inflation
• Could PBHs and secondary GWs have originated from squeezed initial states?
• Examining the consistency relations describing the three-point functions involving tensors
• Small-scale primordial fluctuations in the 21cm Dark Ages signal
• Delay Spectrum with Phase-Tracking Arrays: Extracting the HI power spectrum from the Epoch of Reionization
• Sharp inflaton potentials and bi-spectra: Effects of smoothening the discontinuity
• GalICS 2.1: a new semianalytic model for cold accretion, cooling, feedback and their roles in galaxy formation
• Constraint on the early-formed dark matter halos using the free-free emission in the Planck foreground analysis
• Power spectrum nulls due to non-standard inflationary evolution

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• Inflation and Primordial Black Holes
• Questions on calculation of primordial power spectrum with large spikes: the resonance model case
• One loop to rule them all: Perturbativity in the presence of ultra slow-roll dynamics
• Observational imprints of enhanced scalar power on small scales in ultra slow roll inflation and associated non-Gaussianities
• Prospects for precision cosmology with the 21 cm signal from the dark ages
• Planck Constraints and Gravitational Wave Forecasts for Primordial Black Hole Dark Matter Seeded by Multifield Inflation
• Loop contributions to the scalar power spectrum due to quartic order action in ultra slow roll inflation
• Enhanced power on small scales and evolution of quantum state of perturbations in single and two field inflationary models
• Primordial black holes and inflation from double-well potentials
• Quest for CMB spectral distortions to probe the scalar-induced gravitational wave background interpretation of pulsar timing array data
• Constraining ultra slow roll inflation using cosmological datasets
• Understanding large scale CMB anomalies with the generalized non-minimal derivative coupling during inflation
• Extended mass distribution of PBHs during QCD phase transition: SGWB and mini-EMRIs
• An analytical approximation of the evolution of the primordial curvature perturbation in the ultraslow-roll inflation
• Generating large primordial fluctuations in single-field inflation for PBH formation
• Global 21 cm signal: a promising probe of primordial features