The observable 21cm signal from reionization may be perturbative

Abstract

We develop an effective perturbation theory (and, equivalently, a bias expansion) for the inhomogeneous 21cm radiation field from reionization. Using large-scale simulations of cosmological reionization, we find that this expansion describes the modes in the simulated 21cm signal over much of the wavenumber range probed by upcoming 21cm arrays. This result provides an understanding of the potential signal shapes that compliments the nonlinear numerical modeling that has been the focus of most previous work. We find that the observable signal often can be described with 2-3 bias coefficients that can be interpreted in terms of the source biases, the average neutral fraction, the characteristic size of ionized regions, and the patchiness of reionization. The 21cm signal serves as a wacky example of a bias expansion in cosmology, with our approach synthesizing key results.

26 JCAP pages, 8 Figures; published in JCAP

References in corpus (19)

• Cosmology at Low Frequencies: The 21 cm Transition and the High-Redshift Universe
• The Effective Field Theory of Cosmological Large Scale Structures
• Model-independent evidence in favor of an end to reionization by z~6
• Evidence of patchy hydrogen reionization from an extreme Ly$\alpha$ trough below redshift six
• Clustering of dark matter tracers: generalizing bias for the coming era of precision LSS
• The morphology of HII regions during reionization
• How accurately can 21 cm tomography constrain cosmology?
• Studying Reionization with Ly-alpha Emitters
• Radiative transfer simulations of cosmic reionization I: methodology and initial results
• Inside-out or Outside-in: The topology of reionization in the photon-starved regime suggested by Lyman-alpha forest data
• A Method for 21cm Power Spectrum Estimation in the Presence of Foregrounds
• First Season MWA EoR Power Spectrum Results at Redshift 7
• Detecting the Rise and Fall of 21 cm Fluctuations with the Murchison Widefield Array
• The Global 21-cm Signal in the Context of the High-z Galaxy Luminosity Function
• Cosmic Reionization On Computers II. Reionization History and Its Back Reaction on Early Galaxies
• Higher Order Contributions to the 21 cm Power Spectrum
• Inhomogeneous Helium Reionization and the Equation of State of the Intergalactic Medium
• A Linear Perturbation Theory of Inhomogeneous Reionization
• The Linear Perturbation Theory of Reionization in Position-Space: Cosmological Radiative Transfer Along the Light-Cone

Cited by in corpus (27)

• Inferring the astrophysics of reionization and cosmic dawn from galaxy luminosity functions and the 21-cm signal
• Improved Constraints on the 21 cm EoR Power Spectrum and the X-Ray Heating of the IGM with HERA Phase I Observations
• Modeling Biased Tracers at the Field Level
• An EFT description of galaxy intrinsic alignments
• A tale of two sites -- I: Inferring the properties of minihalo-hosted galaxies from current observations
• Modeling Galaxies in Redshift Space at the Field Level
• Reconstructing large-scale structure with neutral hydrogen surveys
• An Effective Model for the Cosmic-Dawn 21-cm Signal
• Position-dependent power spectra of the 21-cm signal from the epoch of reionization
• A tale of two sites -- II: Inferring the properties of minihalo-hosted galaxies with upcoming 21-cm interferometers
• Exploring the likelihood of the 21-cm power spectrum with simulation-based inference
• Measuring the EoR Power Spectrum Without Measuring the EoR Power Spectrum
• Modeling HI at the field level
• Signatures of Cosmic Reionization on the 21cm 2- and 3-point Correlation Function I: Quadratic Bias Modeling
• The Morphology of Reionization in a Dynamically Clumpy Universe
• An Effective Bias Expansion for 21 cm Cosmology in Redshift Space
• The large-scale 21-cm power spectrum from reionization
• A Model-Insensitive Baryon Acoustic Oscillation Feature in the 21 cm Signal from Reionization
• On the accuracy of common moment-based radiative transfer methods for simulating reionization
• Optical depth to reionization from perturbative 21cm clustering
• The First Billion Years in Seconds: An Effective Model for the 21-cm Signal with Population III Stars
• A new scale in the bias expansion
• A galaxy-free phenomenological model for the 21-cm power spectrum during reionization
• The HI Bias during the Epoch of Reionization
• Interferometric HI intensity mapping: perturbation theory predictions and foreground removal effects
• Probing the intergalactic medium during the Epoch of Reionization using 21-cm signal power spectra
• Field-level Reconstruction from Foreground-Contaminated 21-cm Maps