Test de la gravité avec les RSD autour des vides cosmiques dans le relevé DESI

Stage numéro : Doctorat-2427-RE-05
Laboratoire :Centre de Physique des Particules de Marseille Case 902
 163 avenue de Luminy - 13288 Marseille Cedex 9
Directeur :Cristinel Diaconu - - diaconu@cppm.in2p3.fr
Correspondant :William Gillard - - gillard@cppm.in2p3.fr
Groupe d'accueil :Renoir
Chef de groupe :Dominique Fouchez - - fouchez@cppm.in2p3.fr
Directeur de thèse :S. Escoffier / P. Vielzeuf - 04 91 82 76 64 - escoffier@cppm.in2p3.fr

Thématique : Cosmologie observationnelle

Although the universe is well described by the concordance model LCDM, the nature of its components, dark matter and dark energy, remains a major puzzle of modern cosmology. While historically most attention has been paid to the overdense regions, the underdense regions account for about 80 per cent of the total volume of the observable Universe and strongly influence the growth of large-scale structure. As voids are nearly devoid of matter, they have proved to be very promising objects for exploring the imprint of possible modifications of General Relativity (GR) such as f(R) gravity or extended gravity theories.

The RENOIR cosmology team at CPPM focuses on the understanding of the history and composition of our Universe, particularly on its dark components. The team is particularly involved in large spectroscopic surveys Dark Energy Spectroscopic Instrument at Mayall, US and the European space mission Euclid, that will provide the observation of 40 million of galaxies, the largest 3D map of the Universe ever made.

A promising way to probe modified gravity models is to constrain the growth of structure of the Universe using information from Redshift Space Distortions around cosmic voids. The aim of the PhD thesis is on the extraction of cosmological constraints using Alcock-Paczynski deformation information and RSD information around voids, with DESI data which started its observations in 2021 for 5 years.

Please send your application to Dr. S. Escoffier and P. Vielzeuf (escoffier@cppm.in2P3.fr and vielzeuf@cppm.in2p3.fr), 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 eric.kajfasz@univ-amu.fr

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

- A copy of the master's diploma