Mapping 10 Billion Years of Cosmic History with Type Ia Supernovae

Mar 07, 2022 - 11:00 am to 12:00 pm

SLAC, FKB 3rd Floor Conf. Room (must have SLAC badge to be on site)

Dillon Brout (Harvard) via zoom

Zoom Recording

Type Ia Supernovae (SNeIa) are a central pillar of cosmology that is vital to the adoption of the LambdaCDM “Standard Model of cosmology”, but they also uniquely elucidate persistent gaps in the theory. I will detail recent monumental leaps in progress of SNIa analyses that have culminated in the Pantheon+ cosmological analysis which is an improvement of a factor of 2 over its predecessor and that is the current best measurement of the dominant energy density components of the universe and the current best constraint on extensions to LambdaCDM including evolving dark energy. Additionally I will discuss the recent Pantheon+SH0ES  constraints of the local value of the Hubble Constant that are now even more robust to systematics and that have now crossed the significant 5 sigma threshold of discrepancy when compared to that of Planck+LambdaCDM. I will also discuss efforts that I am leading in the Dark Energy Survey, for which improvements in machine learning SN classification have been critical, and in a new long term survey “DEBASS” that will open up new avenues for constraining other cosmological parameters with SNe such as the growth of structure. Lastly, I summarize the lessons learned over the last 5 years and their impact on the future Vera Rubin LSST and Nancy Grace Roman Space Telescope SN surveys. While recent improvements now require a re-assessment of priorities, the futures of Rubin and Roman are ultimately even more promising than initially anticipated.