Cosmology Seminar: Agnes Ferté
Agnes Ferté is a Postdoctoral researcher at the University of Edinburgh.
Testing gravity on cosmological scales with CMB and LSS
Various cosmological observations indicate that the expansion of the Universe is accelerating. The presence of a dark energy could explain this acceleration but it also could be due to general relativity (GR) being incorrect at large scales. Various theories of modified gravity have been proposed to address this open problem. In this talk I will review some of these theories and will then focus on phenomenological parametrisation of modified gravity. Cosmological observables such as the cosmic microwave background and the large scale structures are great probes to test these deviations from GR. I will explain how we proceed and show constraints on deviations from GR obtained in previous studies. Finally I will talk about our work that develop further these previous studies with recent data sets and show preliminary results. This work is performed in the context of the Dark Energy Survey for which I will give a brief description.