Speaker:	Géza Csörnyei
Title:	SNe II the rescue: independent determination of the Hubble constant through spectral modeling of Type II supernovae
Date (JST):	Wed, Mar 25, 2026, 11:00 - 12:00
Place:	Seminar Room A
Abstract:	The main question shaping today’s cosmology is the Hubble tension, the apparent discrepancy between the measured near- and far-Universe Hubble constants, H0, potentially suggesting physics beyond Lambda-CDM. Most local measurements to date use the concept of the cosmic distance ladder, the empirical path to H0. In this talk, I will describe the use of Type II supernovae, exploding red supergiant stars, for distance estimation, which provides an independent avenue here. The method we use is based on the radiative transfer modeling of optical spectra, yielding precise luminosity estimates. Beyond showcasing the method itself, I will describe a number of empirical tests we conducted in recent years, along with a proof of principle H0 estimate based on a literature sample of objects.

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