![Distribution of red luminous galaxies and the corresponding cosmic web at redshift 0.4-0.7 and primordial density fluctuations at redshift 100 Distribution of red luminous galaxies and the corresponding cosmic web at redshift 0.4-0.7 using 10 redshift snapshots to describe the cosmic evolution in the computations (left panel; galaxies and the underlying cosmic web in red and grey, respectively). The primordial density fluctuations at redshift 100 are shown in the right panel. It is shown how the survey mask and radial selection effects are considered and the whole volume in the box is sampled with Bayesian models.](/sites/default/files/styles/crop_square_2_2_to_320px/public/images/news/COSMICBIRTHBOSS.png?h=e5731a8b&itok=9UQx4Qhr)
We present COSMIC BIRTH (COSMological Initial Conditions from Bayesian Inference Reconstructions with THeoretical models): an algorithm to reconstruct the primordial and evolved cosmic density fields from galaxy surveys on the light-cone. The displacement and peculiar velocity fields are obtained from forward modelling at different redshift snapshots given some initial cosmic density field within a Gibbs-sampling scheme. This allows us to map galaxies, observed in a light-cone, to a single high redshift and hereby provide tracers and the corresponding survey completeness in Lagrangian space
Advertised on