The cosmological constant is physics’ most embarrassing problem

Re:The cosmological constant is physics’ most embarrassing p... by simiones on Tuesday February 02, 2021 @06:24AM (#25999729)

And yet, photons can keep interacting with both versions, while we are forever unable to see the other version of the cat. The problem doesn't go away.

Even more interestingly, say you want to predict the outcome of a quantum experiment. In the MWI, that outcome is deterministic, and it is a superposition in Hilbert space. However, in your own space, you still need to compute a probability for that outcome.

What is this a probability of in the MWI? The concept of probability across worlds is not really rigorously defined, especially since you need to arrive at very specific results to be consistent with observations.

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Re:The cosmological constant is physics’ most embarrassing p... by DavidSJ on Tuesday February 02, 2021 @06:37AM (#25999808)

I address your first point here: https://news.ycombinator.com/item?id=25999766 (in brief, photons are treated no differently than people).

I agree that the meaning of probability in the MWI context is an interesting open question. Mathematically, it's the squared amplitude of part of the wave function. But why this corresponds to our personal experience of frequency is something I'm unclear on.

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