Keywords
Plain language summary
1 Introduction
2 Science Goals
2.1 A large homogeneous galaxy survey in the distant Universe
2.2 Constraining cosmological parameters via BAO and clustering
2.3 Line-intensity mapping (tomography)
2.4 Surveying cluster galaxies in the distant Universe
3 Technical Justification
3.1 AtLAST as a sub-mm redshift machine
3.2 Surveying proto-cluster galaxies
4 Summary and Conclusions