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SUMMARY:Intrinsic tension in the supernovae sector of the local Hubble con
 stant measurement and its implications
DTSTART;VALUE=DATE-TIME:20230530T154500Z
DTEND;VALUE=DATE-TIME:20230530T161000Z
DTSTAMP;VALUE=DATE-TIME:20261017T063353Z
UID:indico-contribution-961@cern.ch
DESCRIPTION:Speakers: Radoslaw WOJTAK ()\nI will start my talk with a brie
 f critical review of cosmological proposals put forward as potential so- l
 utions to the Hubble constant tension. I will argue that the lack of decis
 ive observational evidence supporting any of the current models should mot
 ivate our community to reassess the risk-to-gain ratio of this line of res
 earch and perhaps restore a balance between the efforts put in testing a w
 ide range of possible testing systematic effects in the measurements of th
 e Hubble constant and ad hoc modifications of the standard cosmological mo
 del. In the second part of my talk\, I will discuss a new reanalyses of Ce
 pheid and type Ia supernova data used in the local determination of the Hu
 bble constant. I will show the evidence of a discrepancy between the colou
 r correction of supernovae in the calibration sample and the Hubble flow. 
 This discrepancy is currently an intrinsic tension in the local determinat
 ion of the Hubble constant and a source of unaccounted systematic errors. 
 I will show that applying supernova standardisation which accounts for thi
 s anomaly by resolving two different observationally and theoretically mot
 ivated supernova popu- lations related to two progenitor channels and dust
  extinction in their environments\, yields the Hubble constant which is co
 nsistent with the Planck value. The new standardisation method is based on
  a novel Bayesian hierarchical model of type Ia supernovae which explains 
 completely the Hubble residuals arising from the standard method of supern
 ova standardisation in terms of extinction and intrinsic properties of sup
 ernovae originating from two observationally motivated populations (fast/s
 low decliners correlated with old/young stellar populations). I will give 
 a brief overview of this model\, the current constraints and the perspecti
 ves of using it in cosmological analyses of type Ia supernovae.\n\nhttps:/
 /indico.unina.it/event/70/contributions/961/
LOCATION:Lisbon
URL:https://indico.unina.it/event/70/contributions/961/
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