Hubble Tension in Perspective
In my office today for the first time in a couple of months I stumbled across a folder containing the notes from the summer school for new Astronomy PhD students I attended in Durham in 1985. Yes, that’s thirty five years ago..
Among the lectures was a set given by Richard Ellis on Observational Cosmology from which I’ve taken this little snippet about the Hubble Constant:
It’s not only a trip down memory lane but also up the cosmological distance ladder! You will see that there were two main estimates, one low and one high. Both turned out to be about three sigma away from the currently-favoured value of around 70.
Plus ça change, plus c’est la même chose…
Does this change your mind about today’s tension between another pair of “low” (67) and “high” (73) values?
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In the Dark 
May 19, 2020 at 7:30 am
What is infall?
May 19, 2020 at 9:33 am
The motion of the Local Group towards the Virgo cluster, the presence of which distorts the velocity field away from a pure Hubble flow.
May 20, 2020 at 11:43 pm
aha…Durham..i was there 83-90…phd with Richard Ellis then postdoc….
June 2, 2020 at 3:21 pm
[…] the talk, Colin Hill explains how even though early dark energy can alleviate the Hubble tension, it does so at the expense of increasing other tension. Early dark energy can raise the predicted […]