S319p.166 — The Paris Local Universe Simulation (PLUS): bridging the early and late Digital Universe

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Aug 10th at 6:00 PM until 6:00 PM

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Author(s): Guilhem Lavaux1

Institution(s): 1. CNRS

The Paris Local Universe Simulation (PLUS) is an attempt to reproduce the full chronology of galaxies and Large Scale structure formation of our Local Universe using constrained N-body simulation and known baryon physics. To achieve this we produce initial conditions generated from a full Bayesian analysis of galaxy redshift surveys which include bias analysis, power spectrum sampling, boundary and incompleteness effects and evolutionary effects. These initial conditions are provided to N-body simulation code (like Ramses and Gadget) which provides detailed predictions on the formation of galaxies at all redshift. The result can then be matched one by one with the galaxies observed at low redshift. These simulations constitute an ideal laboratory to link the high and low redshift universe and confront the observations at different redshifts with the predictions of numerical models.
I will show some early results of the PLUS collaboration on the formation of galaxies and galaxy clusters in the late universe and the prediction for how our own galaxies looked like in the early universe. This work is the basis of a more ambitious project aiming at reconstructing the initial conditions of the observable Universe from galaxy surveys, using SDSS (Main sample, LRG, LOWZ and CMASS, eBOSS) and Quasar surveys.