3 ms·

This result has 8.3-sigma confidence, so it's as good as it can get statistically. Even greater confidence than that of the Hubble tension itself. The Hubble T

by nabla9 3y ago

This result has 8.3-sigma confidence, so it's as good as it can get statistically. Even greater confidence than that of the Hubble tension itself. The Hubble Tension is real. The expansion of universe is accelerating.

wrycoder 3y ago
They confirmed[0] that the Hubble Tension[1] is a valid discrepancy between the two different ways of measuring the expansion of the universe. [0] https://iopscience.iop.org/article/10.3847/2041-8213/ad1ddd https://iopscience.iop.org/article/10.3847/2041-8213/ad1ddd [1] https://en.wikipedia.org/wiki/Hubble%27s_law#Hubble_tension https://en.wikipedia.org/wiki/Hubble%27s_law#Hubble_tension
- nabla9 3y ago
  Two different ways in two different times in the lifetime of the universe. expansion rate in the early universe << expansion expansion rate. -> accelerated expansion .
  - layer8 3y ago
    No. The fact that the expansion is accelerating was already established by supernovae measurements alone [0]. The Hubble tension is about the degree of acceleration, not about whether there is an acceleration or not. [0] https://en.wikipedia.org/wiki/Accelerating_expansion_of_the_universe https://en.wikipedia.org/wiki/Accelerating_expansion_of_the_...
mr_mitm 3y ago
> The expansion of universe is accelerating. We knew that before. This goes deeper than that. It accelerates in a way that cannot be explained by a constant dark energy density, which is part of our standard model. We have plenty of alternative models that can explain this, but our measurements are not precise enough yet to rule any of them out. Hopefully Euclid will provide data that is.
- peppertree 3y ago
  I can explain it with higher dimensional turbulence. Where is my Nobel.
  - rrix2 3y ago
    It's in a box wrapped up in your peer-reviewed scientific papers
  - throwway120385 3y ago
    You'll have to perform some experiment to earn that, sorry. Not even Einstein could win a Nobel just by having a good idea.
- echelon 3y ago
  > We knew that before. There was an amazing paper on this published on HN a year or three ago that explained at certain discrete points in the future, entire percentages of the known universe will be beyond our reach. It was profoundly beautiful and sad at the same time. I'll try to dig it up. Edit: found the post (three years ago) and some of the quotes and figures I pulled from it: https://news.ycombinator.com/item?id=26734913 https://news.ycombinator.com/item?id=26734913 Edit 2: another commenter had made a note about the Big Rip. I was writing a response, but they unfortunately deleted their (good) comment. I'll include my response below: > wait until you find out about the Big Rip (paraphrasing) That one's even wilder. To think every atom of every place and loved one you ever touched would vanish infinitely far away. Every atom and then subatomic particle of your own once corporal body, regardless of its final resting place, torn and scattered. Last Contact is a great short story if you're in the mood [1]. Then there's vacuum collapse and all the other theories. I wonder what humans or human descendents 500 years from now will figure out about the universe's ultimate fate. [1] https://zestfullyblog.blogspot.com/2011/02/last-contact-by-stephen-baxter-part-1.html?m=1 https://zestfullyblog.blogspot.com/2011/02/last-contact-by-s...
  - deleted 3y ago
    [deleted]
- 3y ago

by nabla9 3y ago

wrycoder 3y ago

They confirmed[0] that the Hubble Tension[1] is a valid discrepancy between the two different ways of measuring the expansion of the universe. [0] https://iopscience.iop.org/article/10.3847/2041-8213/ad1ddd https://iopscience.iop.org/article/10.3847/2041-8213/ad1ddd [1] https://en.wikipedia.org/wiki/Hubble%27s_law#Hubble_tension https://en.wikipedia.org/wiki/Hubble%27s_law#Hubble_tension

nabla9 3y ago
Two different ways in two different times in the lifetime of the universe. expansion rate in the early universe << expansion expansion rate. -> accelerated expansion .
- layer8 3y ago
  No. The fact that the expansion is accelerating was already established by supernovae measurements alone [0]. The Hubble tension is about the degree of acceleration, not about whether there is an acceleration or not. [0] https://en.wikipedia.org/wiki/Accelerating_expansion_of_the_universe https://en.wikipedia.org/wiki/Accelerating_expansion_of_the_...

mr_mitm 3y ago

> The expansion of universe is accelerating. We knew that before. This goes deeper than that. It accelerates in a way that cannot be explained by a constant dark energy density, which is part of our standard model. We have plenty of alternative models that can explain this, but our measurements are not precise enough yet to rule any of them out. Hopefully Euclid will provide data that is.

peppertree 3y ago
I can explain it with higher dimensional turbulence. Where is my Nobel.
- rrix2 3y ago
  It's in a box wrapped up in your peer-reviewed scientific papers
- throwway120385 3y ago
  You'll have to perform some experiment to earn that, sorry. Not even Einstein could win a Nobel just by having a good idea.
echelon 3y ago
> We knew that before. There was an amazing paper on this published on HN a year or three ago that explained at certain discrete points in the future, entire percentages of the known universe will be beyond our reach. It was profoundly beautiful and sad at the same time. I'll try to dig it up. Edit: found the post (three years ago) and some of the quotes and figures I pulled from it: https://news.ycombinator.com/item?id=26734913 https://news.ycombinator.com/item?id=26734913 Edit 2: another commenter had made a note about the Big Rip. I was writing a response, but they unfortunately deleted their (good) comment. I'll include my response below: > wait until you find out about the Big Rip (paraphrasing) That one's even wilder. To think every atom of every place and loved one you ever touched would vanish infinitely far away. Every atom and then subatomic particle of your own once corporal body, regardless of its final resting place, torn and scattered. Last Contact is a great short story if you're in the mood [1]. Then there's vacuum collapse and all the other theories. I wonder what humans or human descendents 500 years from now will figure out about the universe's ultimate fate. [1] https://zestfullyblog.blogspot.com/2011/02/last-contact-by-stephen-baxter-part-1.html?m=1 https://zestfullyblog.blogspot.com/2011/02/last-contact-by-s...
- deleted 3y ago
  [deleted]
3y ago