The Tools and Methodology Working Group of the GDR CoPhy

This working group is dedicated to raise awareness of new tools and methodology developed in the wider French community to do cosmology. The tools must be understood in a wide sense: it may be large software stack, online websites, or Mathematica© notebook.

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The WG is currently (2022-2024) lead by:

• Guilhem Lavaux (IAP/CNRS)
• Yann Rasera (LUTH/UPC/Paris Observatory)
• Simon Prunet (OCA)

This Working Group aims at sharing and helping the development of tools for which the needs are common to all the actors of the GDR.

It includes:

• tools that are oriented toward the predictions of cosmological observables (including non-linearities) and their relative theoretical systematic uncertainties such as Boltzmann solvers, numerical simulations, approximate methods for the non-linear evolution, and forward modeling,
• development of estimators for data analysis which are for example based on power spectra, and higher order statistics;
• mathematical methods for inference such as the one based on MCMC, Machine Learning, and minimizer;
• production of validation data, such as mock galaxy catalog, mock CMB maps;
• tools for symbolic based computation in the cosmological context.

The activities of this WG rely on specific mathematical technical developments, which will probably require developing links with colleagues in other institutes. Most of the issues addressed in this WG are also closely related to the increasing use of machine learning techniques and the need for specific computational methods and computing centers (high-performance computing, big data). All these topics will be at the heart of the WG, which will organize dedicated meetings once or twice a year.

• GDR Kick off meeting: January 17-19th 2023, LPNHE, Paris