The CLASSgal code for Relativistic Cosmological Large Scale Structure

TL;DR

The paper introduces an enhanced version of the CLASS code that accurately computes relativistic large scale structure observables, including power spectra and correlation functions, for cosmological analysis.

Contribution

A modified, publicly available CLASS code that incorporates relativistic corrections for large scale structure observables in linear perturbation theory.

Findings

The code accurately computes power spectra and correlation functions with relativistic effects.

Demonstrated the code's utility in cosmological parameter estimation.

Provides a tool for full linear-order large scale structure analysis.

Abstract

We present some accurate and efficient computations of large scale structure observables, obtained with a modified version of the CLASS code which is made publicly available. This code includes all relativistic corrections and computes both the power spectrum Cl(z1,z2) and the corresponding correlation function xi(theta,z1,z2) in linear perturbation theory. For Gaussian initial perturbations, these quantities contain the full information encoded in the large scale matter distribution at the level of linear perturbation theory. We illustrate the usefulness of our code for cosmological parameter estimation through a few simple examples.