Campus, Varian 355
Close to a decade in the making, the imminent DESI experiment (desi.lbl.gov <http://desi.lbl.gov/> ) promises to revolutionise our understanding of Dark Energy and extend large-scale structure studies to z~2. But what comes next? The unprecedented depth of LSST will enable 'dropout' selection of Lyman-break galaxies at z~3 and 4 that prove ideal for studies of the primordial Universe and horizon-scale gravity. Based on recent work (arxiv.org/abs/1904.13378, arxiv.org/abs/1903.09208), I'll discuss the potential of this science case for future surveys, in particular with respect to the synergy with CMB lensing and DESI itself.