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The Hubble Constant and its directional dependence: A view from Type Ia supernovae

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If you have a question about this talk, please contact Dongwon Han .

Zoom link: https://zoom.us/j/93983128534.

The Hubble tension is arguably the greatest problem in modern cosmology. Type Ia supernovae are central to the local measurements in multiple ways. Here, I will talk about the analysis of the first data release of SNe Ia from the Zwicky Transient Facility (ZTF) and the ZTF -only distance ladder calibrated to the tip of the red giant branch method. This uniform distance ladder is a key method to control the largest sources of systematics for achieving percent-level precision on H0. A complementary route to H0 is via strongly lensed SNe, especially of Type Ia. I will review the recent work on the first resolved strongly lensed SNIa, and the new discovery of SN Zwicky from ZTF . Lastly, I will present work on the directional dependence of the Hubble parameters and cosmic deceleration and its potential implications for the H0 tension.

This talk is part of the Cosmology Lunch series.

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