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seen Apr 7 at 17:04

I like physics.


Apr
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Mar
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Mar
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comment Gravity and the Speed of Light
On the other hand, the questioner is God, so...
Feb
24
awarded  Nice Answer
Feb
16
comment Is quantum uncertainty a function of how matter is distributed in the universe?
I hope others will look at and weigh in on Jan Lalinsky's answer! It is a interesting one, and it provides a route for resolving my question that is, at least for me, nicely unexpected.
Feb
16
comment Is quantum uncertainty a function of how matter is distributed in the universe?
Jan Lalinsky, that is fascinating and consistent with the odd transition Feynman made when he went from his PhD work to QED. Perhaps his efforts to quantize his PhD work led him simply to abandon the oddly complicated half-retarded, half-advanced framework and move to the conceptually far simpler electron photon interactions of QED? I'm pretty sure I've seen comments by Feynman where he was assuming a photon-based interpretation of the half-and-half model, but that's a lot different from producing the actual model.
Feb
16
comment Is quantum uncertainty a function of how matter is distributed in the universe?
A general note on minimalist universes: One needs to be very careful assuming what is possible. Our universe is matter dominated, for example, yet I strongly suspect that a deeply minimalist universe of only one matter particle would be forbidden. An electron-positron pair seems more plausible, but who really knows? I think if we could very clearly answer questions about what kinds of subsets of our universe (not new ones, just subsets) are possible, we would end up with a deeper understanding of how the rules and constants of the Standard Model are related to each other. Just a hypothesis.
Feb
16
comment Is quantum uncertainty a function of how matter is distributed in the universe?
@JánLalinský, that is fascinating, I had never encountered that story. I had noticed that Feynman seemed to make some kind of a sharp mental transition between his PhD work and QED, and the transition is centered around just that issue. I wonder if he ever discussed what changed? Also, thanks for the long answer that I have not yet looked at, but will as soon as I can.
Feb
15
comment Is quantum uncertainty a function of how matter is distributed in the universe?
@Danu, sorry for the slow answer, I've been away from Physics SE for a while. I may be misunderstanding, but it sounds like you are restating in omnidirectional terms the basis of my question: Photons are only emitted towards matter. So, if there is no matter other than the one electron (not possible actually), there is no emission. If you add matter elsewhere in this minimalist universe, however, a directionally biased form of emission becomes possible.
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