This is pretty cool. Rather comforting for the existential dread
this post was submitted on 05 Apr 2024
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I agree!
Again, these observation do not fit LCDM. (...but do fit my baby model ) ... :
Dr. Riess of Johns Hopkins, who had an early look at the DESI results, noted that the “hint,” if validated, could pull the rug out from other cosmological measurements, such as the age or size of the universe.
The following is what has been observed :
As a measure of distance, the researchers used bumps in the cosmic distribution of galaxies, known as baryon acoustic oscillations. ~~These bumps were imprinted on the cosmos by sound waves in the hot plasma that filled the universe when it was just 380,000 years old. Back then, the bumps were a half-million light-years across. Now, 13.5 billion years later, the universe has expanded a thousandfold, and~~ the bumps — which are ~~now~~ 500 million light-years across — serve as convenient cosmic measuring sticks.
The DESI scientists divided the past 11 billion years of cosmic history into seven spans of time. ~~(The universe is 13.8 billion years old.)~~ For each, they measured the size of these bumps and how fast the galaxies in them were speeding away from us and from each other.
When the researchers put it all together, they found that the usual assumption — a constant dark energy — didn’t work to describe the expansion of the universe. Galaxies in the three most recent epochs appeared closer than they should have been, suggesting that dark energy could be evolving with time.
They still do not hypothesize that ~~baronic~~ barionic matter could be continually created as time goes on (which is what I say* ) but they do hypothesize that dark energy does change over time which is an equally hard hypothesis.
*i say also that space develop exponantially at constant ~~mater~~ matter (barionic) density.
Edits : ~~typpo~~ typos
If you aren't familiar with it, you might want to look into Neil Turok's theory:
https://insidetheperimeter.ca/a-mirror-universe-might-tell-a-simpler-story-neil-turok/
He and his coauthor have addressed a number of outstanding puzzles in cosmology with it, and of everything I've seen it's where I'd put my money for future gains.
From your link :
“It’s an approach that was born out of a certain sense of frustration with previous approaches. In my view, they had all become rather complicated and contrived, including my own approaches,” Turok said during a recent Perimeter Public Lecture (...)
I like it and I share his frustrations. Thanks for this article.
I like strong opinions, but you would sound more believable if uou made the effort to spell the critical terms correctly
English is not my first language. What blunder did I do ? I read everything again and I still don't see it.