Sunday, November 30, 2025

Strike Three for the Cosmological Constant?

It looks like the cosmological constant, aka lambda, aka dark energy has taken another hit. First it was the timescape model, which I blogged about before. According to this model, the apparent acceleration of the expansion of the universe is just an illusion brought on by time dilation and growing voids. Then a paper came out claiming, based on some data from the Desi telescope, that although dark energy is real, the cosmological constant may not be constant after all. It changes over time. I blogged about that, too. Now, a new study claims that the expansion of the universe may not be accelerating after all. Sabine Hossenfelder made a video about it.

These are interesting times.

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