Bridging Simulations and EFT: A Hybrid Model of the Lyman-Alpha Forest Field

Abstract

The Lyman-alpha (Lya) forest is a unique probe of cosmology and the intergalactic medium at high redshift and small scales. The statistical power of the ongoing Dark Energy Spectroscopic Instrument (DESI) demands precise theoretical tools to model the Lya forest. We present a hybrid effective field theory (HEFT) forward model in redshift space that leverages the accuracy of non-linear particle displacements computed using the N-body simulation suite AbacusSummit with the predictive power of an analytical, perturbative bias forward model in the framework of the effective field theory (EFT). The residual noise between the model and the simulated Lya field has a nearly white (scale-and orientation-independent) power spectrum on quasi-linear scales, substantially simplifying its modeling compared to a purely perturbative description. As a consequence of the improved control over the 3D Lya forest stochasticity, we find agreement between the modeled and the true power spectra at the 5 per cent level down to scales of k <= 1 h/Mpc. This procedure offers a promising path toward constructing efficient and accurate emulators to predict large-scale clustering summary statistics for full-shape cosmological analyses of Lya forest data from both DESI and its successor, DESI-II.

11 pages, 6 figures, 3 tables. Submitted to Phys. Rev. D. Comments welcome

References in corpus (44)

• DESI 2024 VI: Cosmological Constraints from the Measurements of Baryon Acoustic Oscillations
• The Effective Field Theory of Cosmological Large Scale Structures
• Baryon Acoustic Oscillations in the Ly-α forest of BOSS quasars
• Clustering of dark matter tracers: generalizing bias for the coming era of precision LSS
• The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Baryon acoustic oscillations with Lyman-$\alpha$ forests
• DESI 2024 IV: Baryon Acoustic Oscillations from the Lyman Alpha Forest
• Lyman-alpha Constraints on Ultralight Scalar Dark Matter: Implications for the Early and Late Universe
• AbacusSummit: A Massive Set of High-Accuracy, High-Resolution $N$-Body Simulations
• Can sterile neutrinos be ruled out as warm dark matter candidates?
• Dark energy and curvature from a future baryonic acoustic oscillation survey using the Lyman-alpha forest
• Possible evidence for an inverted temperature-density relation in the intergalactic medium from the flux distribution of the Lyman-alpha forest
• Redshift-Space Distortions in Lagrangian Perturbation Theory
• Consistent Modeling of Velocity Statistics and Redshift-Space Distortions in One-Loop Perturbation Theory
• The $\text{Abacus}$ Cosmological $N$-body Code
• A consistent and robust measurement of the thermal state of the IGM at $2\le z\le 4$ from a large sample of Ly$\alpha$ forest spectra: Evidence for late and rapid HeII reionization
• New Constraints on Warm Dark Matter from the Lyman-$\alpha$ Forest Power Spectrum
• The cosmology dependence of galaxy clustering and lensing from a hybrid $N$-body-perturbation theory model
• Simulations and symmetries
• Unveiling Dark Matter free-streaming at the smallest scales with high redshift Lyman-alpha forest
• New limits on light dark matter - proton cross section from the cosmic large-scale structure
• Modeling Galaxies in Redshift Space at the Field Level
• The BACCO simulation project: biased tracers in real space
• The Dark Energy Spectroscopic Instrument: One-dimensional power spectrum from first Lyman-$\alpha$ forest samples with Fast Fourier Transform
• How to estimate the 3D power spectrum of the Lyman-$\alpha$ forest
• An emulator for the Lyman-$\alpha$ forest in beyond-$\Lambda$CDM cosmologies
• Cosmology beyond BAO from the 3D distribution of the Lyman-$\alpha$ forest
• The Bacco Simulation Project: Bacco Hybrid Lagrangian Bias Expansion Model in Redshift Space
• Inferring the Thermal History of the Intergalactic Medium from the Properties of the Hydrogen and Helium Lyman-alpha Forest
• Priors on red galaxy stochasticity from hybrid effective field theory
• Constraints on the cosmic expansion rate at redshift 2.3 from the Lyman-$\alpha$ forest
• CoLoRe: fast cosmological realisations over large volumes with multiple tracers
• Modeling HI at the field level
• The 3D Lyman-$\alpha$ Forest Power Spectrum from eBOSS DR16
• The Ly$\alpha$ forest flux correlation function: a perturbation theory perspective
• Characterizing Protoclusters and Protogroups at z $\sim$ 2.5 Using Ly$\alpha$ Tomography
• The ACCEL${}^2$ project: simulating Lyman-$\alpha$ forest in large-volume hydrodynamical simulations
• Mapping Lyman-alpha forest three-dimensional large scale structure in real and redshift space
• Fast, high-fidelity Lyman $\alpha$ forests with convolutional neural networks
• HyPhy: Deep Generative Conditional Posterior Mapping of Hydrodynamical Physics
• A measurement of the Lyman-beta forest power spectrum and its cross with the Lyman-alpha forest in X-Shooter XQ-100
• The ACCEL2 Project: Precision Measurements of EFT Parameters and BAO Peak Shifts for the Lyman-$\alpha$ Forest
• Planting a Lyman alpha forest on AbacusSummit
• LyMAS reloaded: improving the predictions of the large-scale Lyman-α forest statistics from dark matter density and velocity fields
• The Compressed 3D Lyman-Alpha Forest Bispectrum