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SUMMARY:Astrophysical bias of Type Ia Supernovae and the Hubble Constant T
 ension - Mickael Rigault (CNRS | IN2P3)
DTSTART:20190429T120000Z
DTEND:20190429T130000Z
UID:TALK123847@talks.cam.ac.uk
CONTACT:Sadra Jazayeri
DESCRIPTION:Type Ia supernova are powerful cosmological distance indicator
 s that enable us to measure the expansion history of the Universe. Using S
 Ne 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 measurement
 s of H0 are ~4 sigma away from the those derived from CMB temperature anis
 otropy measurements from Planck.  This highly discussed tension could be a
  sign of new physics\, such as a new family of neutrinos.  However\, I wil
 l discuss how recent studies of SNe Ia in the nearby Universe indicate two
  separate populations of SNe Ia with different peak luminosities. These di
 fferences in the underlying SNe Ia population could introduce a bias in th
 e derived H0 and be the true cause of the tension with CMB measurements.
LOCATION:CMS\, Pav. B\, CTC Common Room (B1.19) [Potter Room]
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