Las mañanas IFCA

Discovering CLOE: the Code for the Cosmological Likelihood and Observables in Euclid

by Guadalupe Cañas-Herrera

Marie Curie (Claustro) (IFCA)

Marie Curie (Claustro)



Abstract. Our universe is composed mostly of dark matter and dark energy. Thanks to the observations of the Cosmic Microwave Background (CMB), cosmologists have established a successful model that aims to explain our universe: the LCDM model. However, the era of cosmology based on observations of the CMB is close to an end. In the near future, most of the constraining power will come from the observations of the Large Scale Structure of the universe. In this sense, the ESA Euclid satellite, whose launch is happening soon, will be essential. This mission will create one of the largest catalogues of galaxies ever. To extract the cosmological information contained in the catalogue, scientists will use a Bayesian statistical approach. The Euclid Inter-Science Taskforce Likelihood is in charge of developing and delivering the official likelihood software for the Euclid Consortium. This code will be essential for the future analysis of cosmological models once the Euclid data is available. During the last year, the Taskforce has been working on the implementation of the Weak Lensing and Galaxy Clustering observables' recipes to build version 1.0 of the code. This version computes the theoretical predictions and the likelihood values given some benchmark data, and it is also fully compatible with pre-existing cosmological Bayesian analysis tools. As one of the main software developers within the Taskforce, in this talk, I will guide you through the goals of the Euclid mission, show how the observables are modeled, explain the main characteristics and functionalities of the likelihood code as well as some preliminary results obtained with it.

Guadalupe Cañas-Herrera is a PhD candidate at Leiden University, as a De Sitter Fellow in both the Lorentz Institute of Theoretical Physics and Leiden Observatory. She is interested in theoretical extensions of the standard cosmological model. In Euclid, she is a core member of the Inter-Science Taskforce Likelihood working as a developer of the Cosmological Likelihood for Observables in Euclid (CLOE) code. In fall 2022, she will start working at ESA as a Research Fellow.