TH Cosmo Coffee

Cosmological parameters from full-shape BOSS+eBOSS data and theoretical modelling of one-point probability distribution function for cosmological counts in cells

by Anton Chudaykin (McMaster University)

Europe/Zurich
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CERN

Description

In the first part of my talk, I present the effective-field theory (EFT)-based cosmological full-shape analysis of the anisotropic power spectrum of eBOSS quasars. We perform extensive tests of our pipeline on simulations, paying particular attention to the modeling of observational systematics. Our measurements are fully consistent with the Planck cosmic microwave background results. This work paves the way for systematic full-shape analyses of quasar samples from future surveys like DESI. I present the full-shape BOSS+eBOSS data analysis in various extensions of the concordance cosmological model.

In the second part, I study the one-point probability distribution function (PDF) for matter density averaged over spherical cells. The leading part to the PDF is defined by the dynamics of the spherical collapse whereas the next-to-leading part comes from the integration over fluctuations around the saddle-point solution. The latter calculation receives sizable contributions from unphysical short modes and must be renormalized. We propose a new approach to renormalization by modeling the effective stress-energy tensor for short perturbations. The model contains three free parameters which can be related to the counterterms in the one-loop matter power spectrum and bispectrum. Alternatively, these parameters can be fitted from the PDF data. We confront the model with the results of high-resolution N-body simulations and find excellent agreement for cell radii r≥10 Mpc/h up to zero redshift.

Videoconference
Cosmo Coffee
Zoom Meeting ID
66371577801
Host
Elena Gianolio
Alternative hosts
Marko Simonovic, Valerie Domcke, Joachim Kopp, Azadeh Maleknejad, Miguel Escudero Abenza, Enea Di Dio, Fabrizio Rompineve
Passcode
93025603
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