Orateur
Description
The dark sector represents the elusive nature of dark matter and dark energy. Possible sources of the dark sector have long been studied, and with recent data releases from the Dark Energy Spectroscopic Instrument (DESI), interest in scalar field sources for the dark sector has been revived. This talk presents recent work examining scalar fields sourcing the dark sector, with a focus on the effects of couplings in the kinetic and potential terms of the scalar fields’ Lagrangian. I will elaborate on the framework of dynamical systems that we use to analyse the effects of said couplings applied to two cases of interest involving coupled dark matter and dark energy scalar fields, as well as the case of a multi-field sourced dark energy. I will also discuss the approach taken to examine the effects of the couplings at linear order and future prospects for the coupled scalar dark sector and implications of data signatures.