12:00–1:00 pm Zoom
Suhail Dhawan, Stockholm/KICC, Cambridge, "Cosmology with Type Ia Supernovae: A View from the Zwicky Transient Facility"
Type Ia supernovae are magnificent stellar explosions that play a starring role in modern cosmology. In the local universe, they can be calibrated to infer the Hubble constant, which is in tension with the value inferred from the early universe. The Hubble tension is one of the most exciting unsolved puzzles in modern cosmology. Moreover, distant Type Ia supernovae have been developed as precision probes of acceleration expansion and are critical to understand the nature of dark energy. In my talk I will present recent studies on potential causes of the Hubble tension, the role of dark energy model assumptions and astrophysical. I will discuss ongoing work with the Zwicky Transient Facility, to build a large sample of SNe Ia from a single, untargeted survey. In context of ZTF, I will also describe previous and ongoing searches for lensed Type Ia supernovae a completely independent probe of the Hubble constant with interesting applications to explore theories of gravity and study high-redshift sources. In addition to constraints on the expansion history, I will present ongoing work on using SNe Ia as a late universe probe of cosmic curvature using machine learning methods and constraints on compact object dark matter using the SN Ia Hubble diagram.