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Astrophysical bias of Type Ia Supernovae and the Hubble Constant Tension

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If you have a question about this talk, please contact Sadra Jazayeri.

Type Ia supernova are powerful cosmological distance indicators that enable us to measure the expansion history of the Universe. Using SNe Ia distances, scientists discovered the accelerating expansion of the Universe, leading to a Nobel prize and a broad focus on understanding the underlying cause of this acceleration. SNe Ia distances are also key to measuring the Hubble Constant, the current expansion rate of the Universe and a key cosmological parameter. Interestingly, the SNe Ia measurements of H0 are ~4 sigma away from the those derived from CMB temperature anisotropy measurements from Planck. This highly discussed tension could be a sign of new physics, such as a new family of neutrinos. However, I will discuss how recent studies of SNe Ia in the nearby Universe indicate two separate populations of SNe Ia with different peak luminosities. These differences in the underlying SNe Ia population could introduce a bias in the derived H0 and be the true cause of the tension with CMB measurements.

This talk is part of the Cosmology Lunch series.

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