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SUMMARY:Accurate determination of H0 with core-collapse supernovae — adH
 0cc [HYBRID]
DTSTART:20260304T123000Z
DTEND:20260304T133000Z
DTSTAMP:20260416T022300Z
UID:indico-event-24550@indico.gsi.de
CONTACT:t.neff@gsi.de
DESCRIPTION:Speakers: Andreas Flörs (GSI)\n\nThe discrepancy between earl
 y- and late-Universe measurements of the Hubble constant remains one of th
 e central challenges in modern cosmology. I will present a distance-ladder
 –independent approach to determining the Hubble constant in the local un
 iverse based on the Expanding Photosphere Method (EPM) applied to Type II 
 supernovae. EPM exploits the geometric relationship between the photospher
 ic expansion velocity and the observed flux to infer distances directly fr
 om first principles\, bypassing traditional calibrators such as CepheidsI 
 will discuss recent methodological advances\, in particular tailored radia
 tive-transfer modelling\, aimed at improving the accuracy and systematic r
 obustness of EPM-based distances. Particular emphasis will be placed on th
 e role of dilution factors and systematic uncertainties associated with no
 n-LTE effects and radiative transfer assumptions. I will show how this met
 hod enables competitive constraints on H0​ from low-redshift Type II sup
 ernovae and assess its potential as an independent probe in the context of
  the Hubble tension. Vogl C.\, et al.\, 2025\, A&A\, 702\, A41. doi:10.105
 1/0004-6361/202452910\n\nhttps://indico.gsi.de/event/24550/\n\nZoom: https
 ://gsi-fair.zoom.us/j/92473872583
LOCATION:KBW 2.27 (GSI)
URL:https://indico.gsi.de/event/24550/
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