DRF: Thesis subject SL-DRF-20-0972
Dark energy and cosmological constraints with emission line galaxies in the spectroscopic survey DESI
The late acceleration of the Universe expansion, revealed at the end of the 1990s and confirmed since then with more precise cosmological data, remains unexplained. Modifications to General Relativity at large scales offer a promising explanation. Among the measures, that of the growth rate of structures is the most direct way to test the predictions of General Relativity, since gravity is the driving force behind this growth. This PhD proposes to use observations of the recently commissioned DESI spectrograph to measure the clustering of emission line galaxies, the main tracer of DESI. The aim is to derive a measurement of the growth rate of structures and to compare it with General Relativity predictions in order to search for possible deviations.
The thesis will take place at Irfu, the Institute for Research on the Fundamental laws of the Universe. The PhD student will join the cosmology group of Irfu/DPhP, composed of 9 physicists, 6 PhD students and 2 post-docs. Actively involved in the eBOSS and DESI experiments, the group also participates in Euclid and has in the past had a strong contribution in the SNLS, Planck and BOSS international collaborations. The future PhD student will be integrated into the DESI collaboration and will benefit from all the group’s expertise acquired on BOSS and eBOSS.
Service de Physique des Particules
Groupe Cosmologie (GCOSMO)
Start date of the thesis: 01/10/2020
91191 Gif-sur-Yvette Cedex