PeterDonis's latest activity
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PeterDonis replied to the thread I Question about Parallel Transport.I know it's well defined, I'm just not sure it's what the OP intended by "the same direction" along a non-geodesic curve. I wasn't... -
PeterDonis replied to the thread I Question about Parallel Transport.It depends on what "in the same direction" means. Parallel transport is one way of defining what "in the same direction" means...
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PeterDonis replied to the thread A Collapse of wave function and consciousness.The OP refers to: Those are ways of describing the "consciousness causes collapse" interpretation of QM. The OP might not have...
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PeterDonis replied to the thread A Collapse of wave function and consciousness.But we don't know that consciousness is a "basic element of Physics". Chalmers might think it is (although at different times he says...
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PeterDonis replied to the thread B Matter density right after the decoupling.Yes. Because plasma doesn't work like air. Even at such extremely low density, it interacts strongly with light.
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PeterDonis replied to the thread B Matter density right after the decoupling.Yes. Yes, ##z = 0## means now. Yes. How does that compare to, say, the number density of particles per cubic meter in air at the...
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PeterDonis replied to the thread B Matter density right after the decoupling.Yes. But you don't need to know that to do the calculation I described in post #2.
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PeterDonis replied to the thread B Matter density right after the decoupling.The Wikipedia page you linked to gives a formula for the number density of hydrogen as a function of the redshift ##z##. From that you...
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PeterDonis replied to the thread B Need help understanding particle physics and quantum physics.They're what our best current theory of the fundamental physics of matter says everything is made of. If that makes them "physical...
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PeterDonis replied to the thread B Need help understanding particle physics and quantum physics.Quantum fields. There is no other answer as far as physics is concerned, at least not with our best current models. Quantum fields are...
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PeterDonis replied to the thread B Need help understanding particle physics and quantum physics.According to our best current theoretical models, they're quantum fields. Yes. This is much too vague. We can't give you a course in...
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PeterDonis replied to the thread I The Extended Wigner's Friend Scenarios.I didn't use the word "path", nor does my argument depend on the electron having a particular path. My point was simply that there is a...
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PeterDonis replied to the thread A Collapse of wave function and consciousness.This is really a separate question from the one you're asking in this thread. If you want to discuss the Penrose-Hameroff proposal...
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PeterDonis replied to the thread A Collapse of wave function and consciousness.Moderator's note: Thread moved to the QM interpretations subforum.
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PeterDonis reacted to DaveC426913's post in the thread A three month long summer vacation from public school seems stupid with
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And this happens magically? As someone who works as support staff in education, I can tell you that the work put in at graduation and...