PeterDonis's latest activity
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PeterDonis replied to the thread I Before the Big Bang.In the Hawking no boundary proposal, as I noted before, the manifold describing the universe "before the Big Bang" is purely spacelike... -
PeterDonis reacted to SiennaTheGr8's post in the thread A Jackson: justification of the Poynting vector by GR with
Like.
I briefly looked at some GR books for an explanation but didn't find anything. I had better luck with graduate-level E&M books; in... -
PeterDonis replied to the thread I Questions about quantum cosmology.It's a very new and speculative field. No. It's too early to tell. This is a question you'll need to answer by looking at the...
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PeterDonis replied to the thread I Before the Big Bang.In Hawking's "no boundary" model, the portion of the model "before" the initial time (which is shaped, heuristically, like a hemisphere...
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PeterDonis replied to the thread I 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...
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PeterDonis replied to the thread I Where did the early photons go?.Thread closed for moderation.
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PeterDonis replied to the thread I 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 I Where did the early photons go?.You're welcome! :smile:
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PeterDonis replied to the thread I 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 I 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 B Why Do Events Freeze For Me at the Speed of Light? with Like.
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...
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PeterDonis replied to the thread I 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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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 I 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.