University of Minnesota
School of Physics & Astronomy

Physics and Astronomy Calendar

Friday, October 11th 2019
2:30 pm:
Speaker: Steve Rodney, University of South Carolina
Subject: Supernova Cosmology, Present and Future

The use of Type Ia supernovae (SNIa) as standardizable candles has been one of the pillars of modern cosmology for several decades. The luminosity distance-redshift relation for SNIa–which led to the discovery of cosmic acceleration at the turn of the millenium–is now being used to measure the dark energy equation of state. SNIa are also a player in the roiling crisis over precision measurements of the Hubble-LeMaitre constant, H0. Measurements of H0 from the early universe can not be reconciled with nearby constraints. This may be a chink in the foundations of the Lambda-CDM "concordance cosmology" model, and possibly hints at new physics in the early universe. We will review some of the recent developments in SNIa cosmology, incorporating wide-area surveys such as Pan-STARRS and deep infrared campaigns using the Hubble Space Telescope. We will look ahead to the paradigm-shifting surveys on the near horizon, including LSST and WFIRST, which will increase our samples by several orders of magnitude. Finally, we will touch on some of the new tools for SN cosmology that will soon enter the fray, including time delay cosmography using gravitationally lensed SNe.

Faculty Host: Patrick Kelly

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