Primordial density and BAO reconstruction

2016/09/22 by Hong-Ming Zhu, Ue‐Li Pen, Zhu, Hong-Ming +3
Engineering · Medicine · #Advanced MRI Techniques and Applications #Advanced X-ray and CT Imaging #Cardiac Imaging and Diagnostics #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences

paper · pdf · doi:10.48550/arxiv.1609.07041

openalex publication_date 2016/09/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We present a new method to reconstruct the primordial (linear) density field using the estimated nonlinear displacement field. The divergence of the displacement field gives the reconstructed density field. We solve the nonlinear displacement field in the 1D cosmology and show the reconstruction results. The new reconstruction algorithm recovers a lot of linear modes and reduces the nonlinear damping scale significantly. The successful 1D reconstruction results imply the new algorithm should also be a promising technique in the 3D case.

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