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this post was submitted on 08 Apr 2025
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The article over-dramatizes the story. This "deeply wrong" discrepancy is less than 10%. CMB measurements predict a Hubble constant of around 68km/s/Mpc. Distance ladder measurements get around 73km/s/Mpc.
Our current understanding of the universe the Lambda-CDM model is still wildly successful and it's more likely that the true correct model of the universe will be a correction/extension to Lambda-CDM rather than a completely new theory (although if it is a completely new theory that would be pretty cool).
I think you're understating things. The measurements don't have to be 100 km/s/Mpc apart to cause problems for our understanding of the universe. Ruling out measurement error means we have to go back to the drawing board on cosmology. The problem isn't sloppy telescopes or anything -- it's definitely a hole in our current model.
Yes it's a problem with the model. But it a problem that can very likely be fixed. We don't have to throw out the entire model and start from scratch.
If they wanted to use the term "deeply wrong discrepancy", maybe they should have gone with the difference between the universe's expansion predicted by quantum vacuum energy and the actual, much slower observed rate of expansion.
By "much slower", I mean that the theory and the observations differ by something like one hundred and twenty five (!!!) orders of magnitude.
I think the deeply wrong part of it is that the difference is now big enough for the error bars to stop overlapping
The instrumental error bars are no longer overlapping. But if we imagine all the modifications one could make to Lambda-CDM, then there is still a huge "theory" error bar that subsumes all these.
Basically I'm saying the model is wrong, yes, but it can very much be fixed.
But could you make these modifications without diverging from other observations? If it were as easy as you put it, why have scientists been talking about it for decades?
Scientists have came up with countless ways to fix the Hubble tension. But all these modified theories so far are either
One could say that the difference was always this big, but now the error bars have shrunk to the point that they no longer overlap.
Maybe the light does a detour before it reaches the telescopes.