Exploring the High-Redshift Universe with Millimeter-Wave Line Intensity Mapping

Abstract: Answering outstanding questions in cosmology - such as understanding the physics of inflation, dark energy, and reionization - requires observations of ever-increasing volumes of the universe. In this talk I will discuss a new technique for measuring large volumes at high redshift: line intensity mapping (LIM) of far-IR emission lines from galaxies. This technique is enabled by advances in millimeter-wave spectrometer technology. I will introduce SPT-SLIM, a pathfinder experiment at the South Pole Telescope which will demonstrate the use of superconducting on-chip spectrometers for LIM. SPT-SLIM targets galaxies from the peak of cosmic star formation, about 10 billion years ago. I will then discuss the future of mm-wave LIM and the technical advances needed to develop this technique into a next-generation cosmological observable.