The ACCEL2 Project: Precision Measurements of EFT Parameters and BAO Peak Shifts for the Lyman-$\alpha$ Forest

Abstract

We present precision measurements of the bias parameters of the one-loop power spectrum model of the Lyman-alpha (Lya) forest, derived within the effective field theory of large-scale structure (EFT). We fit our model to the three-dimensional flux power spectrum measured from the ACCEL2 hydrodynamic simulations. The EFT model fits the data with an accuracy of below 2 percent up to a wavenumber of k = 2 h/Mpc. Further, we analytically derive how non-linearities in the three-dimensional clustering of the Lya forest introduce biases in measurements of the Baryon Acoustic Oscillations (BAO) scaling parameters in radial and transverse directions. From our EFT parameter measurements, we obtain a theoretical error budget of -0.2 (-0.3) percent for the radial (transverse) parameters at redshift two. This corresponds to a shift of -0.3 (0.1) percent for the isotropic (anisotropic) distance measurements. We provide an estimate for the shift of the BAO peak for Lya-quasar cross-correlation measurements assuming analytical and simulation-based scaling relations for the non-linear quasar bias parameters resulting in a shift of -0.2 (-0.1) percent for the radial (transverse) dilation parameters, respectively. This analysis emphasizes the robustness of Lya forest BAO measurements to the theory modeling. We provide informative priors and an error budget for measuring the BAO feature -- a key science driver of the currently observing Dark Energy Spectroscopic Instrument (DESI). Our work paves the way for full-shape cosmological analyses of Lya forest data from DESI and upcoming surveys such as the Prime Focus Spectrograph, WEAVE-QSO, and 4MOST.

19 pages, 10 figures

References in corpus (33)

• Simulating galaxy formation with black hole driven thermal and kinetic feedback
• DESI 2024 VI: Cosmological Constraints from the Measurements of Baryon Acoustic Oscillations
• Baryon Acoustic Oscillations in the Ly-α forest of BOSS quasars
• Overview of the Instrumentation for the Dark Energy Spectroscopic Instrument
• Nonlinear Evolution of Baryon Acoustic Oscillations
• On the Robustness of the Acoustic Scale in the Low-Redshift Clustering of Matter
• 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
• 4MOST: Project overview and information for the First Call for Proposals
• 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
• Can sterile neutrinos be ruled out as warm dark matter candidates?
• A new analysis of galaxy 2-point functions in the BOSS survey, including full-shape information and post-reconstruction BAO
• Possible evidence for an inverted temperature-density relation in the intergalactic medium from the flux distribution of the Lyman-alpha forest
• Dark energy and curvature from a future baryonic acoustic oscillation survey using the Lyman-alpha forest
• Calibrating the Baryon Oscillation Ruler for Matter and Halos
• Clustering of quasars in SDSS-IV eBOSS : study of potential systematics and bias determination
• New Constraints on Warm Dark Matter from the Lyman-$\alpha$ Forest Power Spectrum
• Cosmological Analysis of Three-Dimensional BOSS Galaxy Clustering and Planck CMB Lensing Cross Correlations via Lagrangian Perturbation Theory
• 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
• 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
• Baryon Acoustic Oscillation Theory and Modelling Systematics for the DESI 2024 results
• Cosmological inference from the EFTofLSS: the eBOSS QSO full-shape analysis
• Cosmological constraints from the power spectrum of eBOSS quasars
• Inferring the Thermal History of the Intergalactic Medium from the Properties of the Hydrogen and Helium Lyman-alpha Forest
• The 3D Lyman-$\alpha$ Forest Power Spectrum from eBOSS DR16
• Non-linearities in the Lyman-$\alpha$ forest and in its cross-correlation with dark matter halos
• The ACCEL${}^2$ project: simulating Lyman-$\alpha$ forest in large-volume hydrodynamical simulations
• Direct cosmological inference from three-dimensional correlations of the Lyman-$\alpha$ forest
• Measurement of the small-scale 3D Lyman-$\alpha$ forest power spectrum
• A measurement of the Lyman-beta forest power spectrum and its cross with the Lyman-alpha forest in X-Shooter XQ-100

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• DESI DR2 Results II: Measurements of Baryon Acoustic Oscillations and Cosmological Constraints
• Fresh Look at Neutrino Self-Interactions With the Lyman-$\alpha$ Forest: Constraints from EFT and PRIYA Simulations
• Cosmology from Planck CMB Lensing and DESI DR1 Quasar Tomography
• The Compressed 3D Lyman-Alpha Forest Bispectrum
• Modeling the Cosmological Lyman-$\alpha$ Forest at the Field Level
• Bridging Simulations and EFT: A Hybrid Model of the Lyman-Alpha Forest Field