PeterDonis's latest activity
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PeterDonis replied to the thread Undergrad Question about discussions around quantum interpretations.No. That's not how the MWI works. In the MWI, all possible outcomes occur, each in its own branch of the wave function. It's not even... -
PeterDonis replied to the thread Undergrad Question about discussions around quantum interpretations.Not that I'm aware of.
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PeterDonis replied to the thread Undergrad Question about discussions around quantum interpretations.It might be because the MWI is the predominant no collapse interpretation, and since every attempt to try to pin down collapse as an...
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PeterDonis replied to the thread Undergrad Question about Parallel Transport.I didn't say the definition of parallel transport assumed geodesics. My concern was the difference between parallel transport and...
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PeterDonis replied to the thread Undergrad 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...
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PeterDonis replied to the thread Undergrad 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 Graduate 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 Graduate 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 High School 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 High School 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 High School 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 High School 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 High School 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 High School 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 High School 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...