PeterDonis's latest activity
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PeterDonis replied to the thread Undergrad Where did the early photons go?.A subthread on how the "speed of expansion" of a material object is defined has been moved to a separate thread in the relativity forum... -
PeterDonis replied to the thread Undergrad Where did the early photons go?.Thread closed for moderation.
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PeterDonis replied to the thread Undergrad Question about discussions around quantum interpretations.In physics is that you are using a model that predicts a random distribution of outcomes. If your model predicts the same outcome every...
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PeterDonis replied to the thread Undergrad Where did the early photons go?.You're welcome! :smile:
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PeterDonis replied to the thread Undergrad Where did the early photons go?.Briefly: An invariant is a quantity that is independent of any choice of coordinates. A scalar is an invariant that is simply a...
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PeterDonis replied to the thread Undergrad Question about discussions around quantum interpretations.The definition of "chance" prevents it. That isn't something specific to QM.
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PeterDonis reacted to jbriggs444's post in the thread High School Why Do Events Freeze For Me at the Speed of Light? with
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Yes, there is a last instant of your home world's future that you will ever see. However, this last instant is not seen when you reach... -
PeterDonis replied to the thread Undergrad Where did the early photons go?.Because we have other ways of inferring what the properties of the universe were before it became transparent to radiation. For example...
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PeterDonis reacted to PeroK's post in the thread Undergrad Where did the early photons go? with Like.
If you want to go beyond popular science, then you could try An Introduction to Modern Cosmology by Andrew Liddle. This is at an...
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PeterDonis replied to the thread Undergrad Question about discussions around quantum interpretations.QM doesn't say there is an "interaction" between the two entangled particles. Certain QM interpretations do, but not all of them.
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PeterDonis replied to the thread Undergrad Question about discussions around quantum interpretations."Pure chance" wouldn't make it happen every single time. No, because "chance" would mean you would get different results on different...
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PeterDonis replied to the thread Undergrad Question about discussions around quantum interpretations.That isn't the way cluster decomposition is presented in the literature, though. There's no claim that it breaks down for measurements...
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PeterDonis replied to the thread Undergrad Question about discussions around quantum interpretations.This would need to be experimentally tested. They don't give any specific numbers, but there are experiments showing Bell inequality...
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PeterDonis replied to the thread Undergrad Where did the early photons go?.That's an invariant which is due to the invariant expansion scalar, yes.
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PeterDonis replied to the thread Undergrad Question about discussions around quantum interpretations.This paper basically seems to be saying that the correlations that break factorizability don't vanish when you look at the correct...