Une nouvelle estimation de la constante de Hubble-Lemaitre H0, le taux d'expansion actuel de l'Univers, vient d'être obtenue grâce à une méthode inédite, celle du délai temporel d'une supernova ayant subi une lentille gravitationnelle, qui s'est retrouvée démultipliée à des époques différentes. Et le résultat est précis à 4 km/s/Mpc... et il est plutôt proche de la valeur déduite du fond diffus cosmologique... Diantre! L'étude fait l'objet de deux articles, un dans Science et l'autre dans The Astrophysical Journal.
Emissions
- Ça Se Passe Là-Haut
- #1494 : Mesure inédite de H0 grâce à une supernova démultipliée réapparue avec un retard, et nouveau pavé dans la mare
Publié le par Eric Simon
Eric Simon
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