Contraintes cosmologiques avec les informations photométriques et spectrocopiques en galaxy clustering sur les données Euclid DR1.

Stage numéro : Doctorat-2427-RE-06
Laboratoire :Centre de Physique des Particules de Marseille Case 902
 163 avenue de Luminy - 13288 Marseille Cedex 9
Directeur :Cristinel Diaconu - -
Correspondant :William Gillard - -
Groupe d'accueil :Renoir
Chef de groupe :Dominique Fouchez - -
Directeur de thèse :S. Escoffier / W. Gillard - 04 91 82 76 64 - /

Thématique : Cosmologie observationnelle

The various observations of the Universe have been indicating for twenty years now that the expansion of the Universe is accelerating. The standard model of cosmology, known as the CDM model, describes the Universe as composed of 27% dark matter and 68% dark energy. Understanding the nature of these two energy components remains one of the greatest challenges in contemporary physics.

The future Euclid space mission is dedicated to the study of dark energy and dark matter in the Universe and to test gravity on cosmological scales. Euclid was selected by the European Space Agency (ESA) in 2011 and has been launched 1st July, 2023 to probe the Universe over a 6 year-period. These data will revolutionize our ability to map the Universe and better understand the nature of dark energy or put Einstein's General Relativity (GR) in default.

Two instruments are embarked on board Euclid, the Near Infrared Spectrometer and Photometer (NISP) and the visible imager (VIS). The spectroscopic survey with the NISP instrument will target 40 millions of galaxies in the redshift range 0.9 < z < 1.8, while the photometric survey will get the image and photometric redshift of two billions of galaxies covering the redshift range 0 < z < 2.5.

The subject of the thesis is to measure the galaxy clustering from the Euclid photometric and spectroscopic catalogs, and studied combined analysis, including 3x2pt analysis.

Please send your application to Dr. S. Escoffier and W. Gillard ( and, including:

- A motivation letter (maximum two pages).

- A curriculum vitae

- A brief description of research interest and past achievements

- Two reference letters (Head of the Master's program, supervisor of the Master internship) to be sent directly to

- A transcript of all university records (Bachelor and Master)

- A copy of the master's diploma