levitopher
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 Apr 28 reviewed Approve Conservation Laws and Symmetry Apr 27 comment Rotational Dynamics Question As per the homework policy, you'll have to give us your attempt before we provide you with an answer. Apr 25 reviewed Approve Milk or sugar first to maximize temperature of a hot cup of tea? Apr 25 reviewed Edit Calculating the change in aceleration the earth feels when you push an object Apr 25 revised Calculating the change in aceleration the earth feels when you push an object Rendered Mathjax. Apr 19 awarded Custodian Apr 16 reviewed Edit What exactly is the difference between radiation, conduction, and convection? Apr 16 revised What exactly is the difference between radiation, conduction, and convection? Changed title Mar 22 reviewed Approve Is there absolute proof for gravitational waves? Mar 17 reviewed Approve How do pressured containers within pressured containers behave? Mar 15 comment Spin-1/2 with expectation values other than $\hbar/2$ You should be able to solve it with a superposition of eigenspinors. Mar 10 comment Standing wave on a circle Since you said "Nature tunes the wave", you should provide us with a specific example. I am not aware of any cases in real life where this happens. I mean, that's what the Bohr model is about, but that's just a model and all aspects of your conceptual understanding might not apply. Bruce Lee's answer is good, except maybe you wanted him to say "if the wavelength remained the same, we would no longer have a standing wave"? Mar 10 awarded Organizer Mar 10 reviewed Edit Where can I find data for the masses/component velocities of galaxies in the Local Group? Mar 10 revised Where can I find data for the masses/component velocities of galaxies in the Local Group? tags modified Mar 4 comment Do the LIGO observations constitute proof of a black hole merger, and what happened to the black holes? In my view, your statement and mine are equivalent. When I say "our conclusions are perfect" I'm referring to how they explain the standard model of physics, generally. One could say "the errors are experimental and the model is true" or "the errors are in the model and the experimental results are true (or, better than the theoretical results)". I just wanted to point out that at this stage, we are in the first category. Feb 28 awarded Nice Answer Feb 27 comment On the nature of forces in general relativity I'm not sure I can clarify enough for an answer, but keep in mind that book is outdated, since it came out before the full development of QFT. The symmetries of the standard model do indeed change the geometry of spacetime, but not in a metric sense, because they are part of the fiber bundle "above" the 4-manifold where the metric lives. Feb 25 reviewed Approve How do I calculate the perturbations to the metric determinant? Feb 22 comment Do the LIGO observations constitute proof of a black hole merger, and what happened to the black holes? mmmm we are getting off topic but I think the interpretation is not quite that either. The physical experiments might be imperfect, but the conclusions we draw are in some sense perfect. That is, we are not saying "GR correctly predicts gravitational waves from BH inspiral, except for a little part which could be due to something else", but rather "GR correctly [...]BH inspiral, and the small deviations are due to experimental errors"