Measuring the redshift-space distortions by cross-correlating the density fields before and after reconstruction

2025/02/12 by Weibing Zhang, Zhang, Weibing, Ruiyang Zhao +11
Physics and Astronomy · Engineering · #Adaptive optics and wavefront sensing #Optical Systems and Laser Technology #Calibration and Measurement Techniques

paper · pdf · doi:10.48550/arxiv.2502.08186

Abstract

In this work, we develop a theoretical model for the cross-power spectrum of the galaxy density field before and after standard baryonic acoustic oscillation (BAO) reconstruction. Using this model, we extract the redshift-space distortion (RSD) parameter from the cross-power spectrum. The model is validated against a suite of high-resolution N-body simulations, demonstrating its accuracy and robustness for cosmological analyses.

Related

• Discreteness Effects in the Post-Reconstruction Galaxy Power Spectrum
• A cosmological full-shape power spectra analysis using pre- and post-reconstructed density fields
• Redshift Space Distortion Reconstruction
• The Poisson noise in modeling the redshift-space distortion at large scales
• Emulating power spectra for pre- and post-reconstructed galaxy samples