Archive for Hubble Constant Tension

Yet another Hubble Constant Update

Posted in The Universe and Stuff with tags , , , , on December 13, 2021 by telescoper

The latest contribution to the ongoing debate about the Hubble constant is a new paper by Adam Riess and collaborators which you can find on the arXiv here. The abstract reads:

As you can see, this group is doubling down up on a high value for the Hubble constant. This longstanding discrepancy gives me an excuse to post my longstanding opinion polls on the topic.

First, would you go for a “high” (73-ish) or “low” (68-ish) value:

Second, do you think the discrepancy or tension is anything to get excited or even tense about?

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Hubble Tension – The Plot Thickens

Posted in The Universe and Stuff with tags , , , on July 2, 2021 by telescoper

One topic on this blog seems to be as perennial as the weeds in my garden: the so-called Hubble Tension. I just saw a review paper by Wendy Freedman, one of the acknowedged experts in this area, on arXiv here. I have abstracted the abstract here:

You can find the PDF here.

What’s particularly interesting about this discussion is that stellar distance indicators have typically produced higher values than the 69.8 ± 0.6 (stat) ± 1.6 (sys) km s-1 Mpc-1 quoted here, which is consistent with the lower value favoured by Planck. See the above graphic discussed here. So perhaps there’s no tension at all. Maybe.

Anyway, here’s that poll again! I wonder if this paper might change the voting.

 

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