Raphael says what a lot of theorists are thinking -- dynamical dark energy (as opposed to a constant vacuum energy density) seems unnatural and raises new problems. But as theorists repeatedly learn, the data have the last word; we will adapt to how the universe turns out to be.
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Raphael Bousso
It’s important to map out our universe! But dynamical dark energy remains wildly implausible. It’s a fanciful notion, requires fine tuning worse than a pencil on its tip, and yet more tuning for the sole purpose of hiding itself from observers for so long. I call it a unicorn in a duck suit here:
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