PeterDonis's latest activity
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PeterDonis replied to the thread High School Independent Inflationary Regions in an Infinite Universe?.How do you know? Why don't we let the OP decide what he's asking, and whether the posts in this thread are useful to him? We've each... -
PeterDonis replied to the thread High School Independent Inflationary Regions in an Infinite Universe?.It is when you're talking about multiverse hypotheses. That's the whole point of them: that every possible universe that could happen...
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PeterDonis replied to the thread High School Independent Inflationary Regions in an Infinite Universe?.Yes.
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PeterDonis replied to the thread High School Independent Inflationary Regions in an Infinite Universe?.That's how Tegmark defines a Level II multiverse. It's true that he defines other levels as well. But the OP appears to be asking about...
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PeterDonis replied to the thread High School Independent Inflationary Regions in an Infinite Universe?.Sure, but the OP's not asking how to define a multiverse. He's asking whether inflationary theory actually says a multiverse exists...
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PeterDonis replied to the thread Graduate Understanding Barandes' microscopic theory of causality.More precisely, on the standard understanding of the experiment, decoherence does not occur until the particle strikes the detector...
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PeterDonis replied to the thread High School Independent Inflationary Regions in an Infinite Universe?.And from that Wikipedia page (thanks to @renormalize for the quote): Proponents and skeptics Modern proponents of one or more of the...
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PeterDonis replied to the thread High School Independent Inflationary Regions in an Infinite Universe?.For reference, the Wikipedia page you mention is here: https://en.wikipedia.org/wiki/Multiverse
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PeterDonis replied to the thread Undergrad Why is the Lorentz force always perpendicular to velocity?.In general this is not the case. The Lorentz force is ##F = q \left( \vec{E} + \vec{v} \times \vec{B} \right)## (modulo some constant...
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PeterDonis replied to the thread Graduate Understanding Barandes' microscopic theory of causality.Such a particle is not isolated--it has to interact with the barrier and the slits to produce the interference pattern.
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PeterDonis reacted to A.T.'s post in the thread Undergrad Why is the Lorentz force always perpendicular to velocity? with
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Not just upward, but to the right (like it was moving before) and upward. So you have to apply the Lorentz transformation along that... -
PeterDonis replied to the thread Graduate Understanding Barandes' microscopic theory of causality.Meaning, basically no actual real systems at all. That doesn't look like a good basis for an interpretation to me.
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PeterDonis replied to the thread Graduate Understanding Barandes' microscopic theory of causality.This seems obviously contrary to experiment: for example, a model like this, it seems to me, would predict that we should not see...
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PeterDonis reacted to Demystifier's post in the thread Graduate Sidney Coleman's opinion on interpretation in his Dirac lecture with Like.
I don't know whether Coleman's position contains something original, but there is something else that I find problematic. Coleman first...
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PeterDonis replied to the thread Undergrad Relativistic Space Travel: Optimizing Proper Time [Project Hail Mary].Thinking of it in terms of top speed puts in an extra step that's not necessary. See my post #34. The mass ratio (for a trip where you...