Iterative reconstruction excursions for Baryon Acoustic Oscillations and beyond

Abstract

The density field reconstruction technique has been widely used for recovering the Baryon Acoustic Oscillation (BAO) feature in galaxy surveys that has been degraded due to nonlinearities. Recent studies advocated adopting iterative steps to improve the recovery much beyond that of the standard technique. In this paper, we investigate the performance of a few selected iterative reconstruction techniques focusing on the BAO and the broadband-shape of the two-point clustering. We include redshift-space distortions, halo bias, and shot noise and inspect the components of the reconstructed field in Fourier space and in configuration space using both density field-based reconstruction and displacement field-based reconstruction. We find that the displacement field reconstruction becomes quickly challenging in the presence of non-negligible shot noise and therefore present surrogate methods that can be practically applied to a much more sparse field such as galaxies. For a galaxy field, implementing a debiasing step to remove the Lagrangian bias appears crucial for the displacement field reconstruction. We show that the iterative reconstruction does not substantially improve the BAO feature beyond an aggressively optimized standard reconstruction with a small smoothing kernel. However, we find taking iterative steps allows us to use a small smoothing kernel more `stably', i.e., without causing a substantial deviation from the linear power spectrum on large scales. In one specific example we studied, we find that a deviation of 13\% in $P(k\sim 0.1h/Mpc)$ with an aggressive standard reconstruction can reduce to 3-4\% with iterative steps.

arXiv comment17 pages, 12 figures, 2 tables. Corrected for minor inconsistencies related to bias and RSD treatment during iterative reconstruction. All relevant figures are updated, while the results stay almost the same

References in corpus (30)

• Planck 2015 results. XIII. Cosmological parameters
• Baryonic Features in the Matter Transfer Function
• Probing Dark Energy with Baryonic Acoustic Oscillations from Future Large Galaxy Redshift Surveys
• Improving Cosmological Distance Measurements by Reconstruction of the Baryon Acoustic Peak
• On the Robustness of the Acoustic Scale in the Low-Redshift Clustering of Matter
• Baryonic Signatures in Large-Scale Structure
• FastPM: a new scheme for fast simulations of dark matter and halos
• Generation of Vorticity and Velocity Dispersion by Orbit Crossing
• Non-linear structure formation and the acoustic scale
• High-precision predictions for the acoustic scale in the non-linear regime
• Reconstruction within the Zeldovich approximation
• Eulerian BAO Reconstructions and N-Point Statistics
• Galaxy Bias and its Effects on the Baryon Acoustic Oscillations Measurements
• Modeling the reconstructed BAO in Fourier space
• On the reach of perturbative descriptions for dark matter displacement fields
• Towards an Optimal Reconstruction of Baryon Oscillations
• An iterative reconstruction of cosmological initial density fields
• Theoretical Systematics of Future Baryon Acoustic Oscillation Surveys
• The Reconstructed Power Spectrum in the Zeldovich Approximation
• Isobaric Reconstruction of the Baryonic Acoustic Oscillation
• The Impact of Wrong Assumptions in BAO Reconstruction
• Halo nonlinear reconstruction
• Perturbation Theory for BAO reconstructed fields: one-loop results in real-space matter density field
• Hunting down systematics in baryon acoustic oscillations after cosmic high noon
• Reconstructing the baryon acoustic oscillations using biased tracers
• Application of the iterative reconstruction to simulated galaxy fields
• Iterative removal of redshift space distortions from galaxy clustering
• Biased tracer reconstruction with halo mass information
• Modeling iterative reconstruction and displacement field in the large scale structure
• Shot noise and reconstruction of the acoustic peak