Philip Macias: Cosmology and Transient Forecasts for The Roman High-Latitude Time-Domain Survey

The Nancy Grace Roman Space Telescope (NGRST) was the top-ranked large space mission in the 2010 Astronomy and Astrophysics Decadal Survey and promises to revolutionize astrophysics after its launch in the mid 2020s. The Roman High Latitude Time Domain Survey (HLTDS) is unique in its combined large field of view, IR sensitivity, and spectroscopic capabilities, and will discover 2,000-15,000 Type Ia Supernovae (SNe) to be used for cosmology (as well as comparable numbers of non-Ia transients). I will present an updated reference HLTDS designed to meet Roman Dark Energy Science Requirements, but which will also be transformational for a variety of transient science. I will describe recent progress in simulating this survey using the Supernova Analysis Package (SNANA) and Pippin, a pipeline for supernova cosmology analysis. Because of the large numbers of SNe we expect Roman to detect, cosmological inferences are likely to be dominated by systematics, underscoring the need for a better understanding of both SN physics and potential biases related to their environments. I will discuss ongoing efforts toward improving our simulations to maximize Roman’s benefit to cosmology and transient science broadly.