Activity for Fred Wamsley
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Edit | Post #294696 | Initial revision | — | 11 months ago |
| Question | — |
Can gravitational waves do work on matter? Feynman answered this with a yes, using a thought experiment with a rod strung with beads that move with friction. He reasoned that a passing wave would result in the beads releasing friction heat. Would it, though? The beads and the rod are in the same metric, wouldn't they (for lack of a bet... (more) |
— | 11 months ago |
| Comment | Post #294583 |
Something related but not an answer is at https://physics.stackexchange.com/questions/83/how-is-squeezed-light-produced. It's about squeezed light, which is easier to understand than squeezed vacuum. (more) |
— | 12 months ago |
| Edit | Post #294583 | Initial revision | — | about 1 year ago |
| Question | — |
How to understand vacuum squeezing in quantum optics? The part that's easy to understand is that amplitude and phase are non-commuting so the more precise you are on one, the more uncertainty in the other. But how, in an application like LIGO, are the amplitude and phase uncertainties controlled? I have looked for explanations and found part... (more) |
— | about 1 year ago |
| Comment | Post #288242 |
With Maxwell's equations being linear and superposition working, isn't there no mechanism (in free space) for photons to interact? (Well, there's gravity: https://en.wikipedia.org/wiki/Geon_(physics)) (more) |
— | about 1 year ago |
| Edit | Post #293259 | Initial revision | — | over 1 year ago |
| Question | — |
Would EMP from a supernova be dangerous a few light years out? Nuclear explosions create electromagnetic pulses which are a hazard to electronics. Would someone a few star systems over from a core collapse supernova be in danger? A quick search turned up only one paper on the subject, https://adsabs.harvard.edu/full/1975ApJ...198..439C, which was from ... (more) |
— | over 1 year ago |