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| bio | website | |
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| location | ||
| age | ||
| visits | member for | 2 years, 1 month |
| seen | 1 hour ago | |
| stats | profile views | 196 |
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Apr 5 |
awarded | Yearling |
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Dec 28 |
comment |
Simulation of QED Nevertheless, I still haven't found any good description of it.. if it really is that more simple than lattice qcd, then you'd expect some descriptions to exist, if nothing else than to "warm up" the reader to lattice qcd.. |
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Dec 7 |
awarded | Fanatic |
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Sep 6 |
comment |
Light speed in space-time. is it really constant? Lightspeed is measured as constant in local frames, i.e. when you measure it where it is. In your example with the black hole, if time is slower there as seen from a more distant observer, that observer will of course see the speed of light there as slower (not faster, as in your numerical figures...). |
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Aug 2 |
answered | Can human hand move at a speed rate like this baseball pitch or is it just the speed of ball? |
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Jul 26 |
comment |
Can extremely charged objects simulate some black hole effects? I'm not sure that is the most pedagogical way to formulate why an electron cannot escape an event horizon. |
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Jul 20 |
answered | Image contrast as function of exposure for a CCD detector |
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Jul 19 |
comment |
Standing wave and energy flux Yeah I'm not sure either, I mean obviously there will be losses at many points.. My answer was built on a purely mathematical analysis of standing waves with an ideal wave-equation. A real loudspeaker has mass that has to be accelerated back and forth and just doing that costs energy so it won't swing "for free", but maybe there is a measurable reduction in driving energy due to the air's feedback effect (in case of a speaker sending the energy to a reflecting wall). Would be an interesting physics experiment! |
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Jul 19 |
answered | Standing wave and energy flux |
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Jul 19 |
revised |
Michelson rotating mirror experiment fixed up according to comments |
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May 15 |
awarded | Good Answer |
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May 10 |
revised |
Is “analog” quantum-computation not useful? added link to the Nature Insight Quantum Simulators review article |
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Apr 5 |
awarded | Yearling |
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Feb 2 |
comment |
What is known about quantum electrodynamics at finite times? @twistor: i know what you're looking for but I can't formulate the question in any better way either :) |
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Jan 9 |
comment |
Simulation of QED I've looked for the same thing and the only thing you find is a lot of lattice QCD talk normally, so I second the question and it would be especially interesting to hear if for example it is impossible or very impractical to simulate QED in the same way for fundamental reasons (the fact that there are other methods currently giving better results for some classes of problem formulations is another issue, IMO). Anyway, interesting introduction you linked! |
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Dec 25 |
comment |
absolute defintion of the right (i. e. not left) direction the problem is usually stated as how do you communicate to an alien friend in another galaxy what right and left is. without any common reference this is impossible of course. it turns out that some particle reactions do not respect this symmetry and thus provide this needed common reference, and i'm sure this is what the friend is referencing. |
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Dec 18 |
comment |
Conservation of momentum leading to damage Actually the introduction in this post about momentum is somewhat misleading as the OP is not talking about momentum in the question, he is talking about the same thing you are (impulse is force during a timestep). But the bottom line, that it is complicated to calculate fractures, is correct of course. |
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Dec 18 |
answered | Conservation of momentum leading to damage |
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Dec 4 |
comment |
What experiment would show water and ice to be the same thing without transitioning one to another? I considered this but some of these experiments require single molecules (that is vapor/gas phase). Mass spectroscopy would be one useful technique. NMR another - that one might work with molecules in situ.. |
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Dec 2 |
comment |
How does electricity propagate in a conductor? you pose dozens of questions about essentially the entire field of quantum physics, quantum electrodynamics etc... and expect answers in layman's terms? i'd suggest you break it up into more questions or something.. |
