English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

This is a transcript of a talk that I gave in Cambridge on 17th July 2020 onthe `Hubble tension'. I review the SH0ES analyses by Riess and collaboratorsand point out some internal inconsistencies, including a discrepancy betweenthe relative distances inferred from Cepheids of two of the primary geometricdistance anchors, the Large Magellanic Cloud (LMC) and NGC 4258. I then ask`what would it take to make SH0ES compatible with early time measurements?'.The answer is a systematic bias of 0.1 - 0.15 mag in the intercept of theCepheid period-luminosity relations of SH0ES galaxies. Such a bias resolves theHubble tension, the tension between the distance anchors, and the differencebetween SH0ES and the tip of the red giant branch (TRGB) distance ladder, asmeasured and calibrated by Freedman and collaborators. I show that thedifference between the TRGB and SH0ES values of H0 is caused mainly by asystematic calibration offset. In the short term, observational efforts shouldbe focussed on improving the calibrations of the distance anchors and nearbygalaxies, rather than trying to measure distance moduli to more supernovae hostgalaxies. I argue that an independent distance estimate to NGC 4258 isparticularly critical. With such observations, it should be possible, on arelatively short timescale, to establish definitively whether the Hubbletension really exists.

A Lockdown Perspective on the Hubble Tension (with comments from the SH0ES team)