Comments by "B. Xoit" (@b43xoit) on "Sabine Hossenfelder" channel.

  1. Laplace transforms are like magic. You crank your diffeq through the transform and it gives an algebraic eq'n. Solve that, then turn the crank backward and run your solution through the inverse Laplace transform, the the result is the solution to your initial diffeq. That's the main thing I remember.
    2
  2. Differential equations.
    2
  3. You need a better translator.
    2
  4. The human race needs a system of coercion to depress the Anglo-Saxon birthrate. All this should be run by women. Men should be allowed to give their opinions and try to persuade, but should not have a vote.
    2
  5.  @CAThompson  It repels flies.
    2
  6. If I understand correctly, quantum field theory (QFT) holds that for every fundamental type of particle, there is a field that pervades all of space, and each individual particle is a perturbation in the field associated with its type. So, for example, an electron is a little wave packet in the electron field, a top quark is a wave packet in the top-quark field, and so on. As for your question about whether an idea represents reality or is just a convenience for calculating predictions, I'm not sure of the philosophical distinction between those two interpretations. So I don't know what you're asking, in that regard.
    2
  7. Thought experiment: person experiences a fugue state. Later they view a video of themselves behaving in that state, and say "I don't remember doing and saying those things, but obviously from my responses and behavior as recorded, I must have been conscious at the time."
    2
  8. The robots gaslit you?
    2
  9. There are two concepts of mass -- inertial and gravitational. And to the best accuracy that physicists have been able to measure to date, each kind of mass equals the other. Mass is explained as energy. Rest mass is binding energy with the Higgs field (I could be wrong). Most of the mass of a proton is in the kinetic energy of the components wiggling around in there plus the binding energy of the strong force. But some of the mass of the proton is from the rest mass of the three quarks.
    2
  10. One electron cannot be distinguished from another electron.
    2
  11. Yes.
    2
  12. Unearth.
    2
  13. Thanks for saying "nuclear" and not "nukular".
    2
  14. ?
    2
  15. I think you have put your finger on the philosophical problem QM raises for many people. The math predicts experimental outcome, but there is no rationale for why that is the right math based on any deeper understanding of any principles that could underlie the phenomena.
    2
  16. Can you explain how to quantify the power (not in the physical sense of the word, but the common sense) of a single vote over the electoral outcome?
    2
  17.  @juvenalsdad4175  Cool. And I'd bet that could be done for aircraft, too.
    2
  18. https://en.wikipedia.org/wiki/Time_crystal
    2
  19.  @TedToal_TedToal  On account of periodicity, I guess. Maybe there's a little more than that, but I don't get it.
    2
  20. No?
    2
  21. 8:54 If the vacuum has negative pressure, does that mean it sucks?
    2
  22. I was thinking along a similar line. The observable region seems to be part of a viewpoint, not part of the real universe. But the expansion seems to be part of reality (by contrast).
    2
  23. I don't know for sure, but I think that if we were to look into it, we would find that the historical record of physicists smashing neuclii together in accelerators and looking at the stuff that flies out gives the hint that the nucleons are distinct. I heard that a kind of resonant effect and/or a spatially uneven distribution of the gluons in a nucleon provides the force that binds the nucleons together to make the nucleus, similar to how with the electromagnetic force rather than the strong force, a resonance and/or uneven spatial distribution of that force within each atom binds atoms to make molecules.
    2
  24. Human "gender".
    2
  25. Because she's saying an "observation" has to involve many particles, not just one.
    2
  26.  @antonystringfellow5152  She's good and I also recommend Leonard Susskind's lecture on entanglement. Even though "entanglement" is in the title, it's really an introduction to QM, using easy math (no diffeq). He begins with what would seem to be the simplest case, measuring the spin on an electron prepared with a magnetic field. The result is only binary, spin up or spin down. But he uses this to show in general how the calculation goes.
    2
  27. Sophisticated programming is an engineered solution. That means the human designers of the system conceived of and implemented a strategy that relates the problem to the solution. This relationship is built out of reasoning. A solution based on AI is more open-ended. There is engineering, but it is not aimed directly at the problem to be solved. It only produces a kind of machine that can be presented in effect with a problem and that casts about for solutions. To my understanding, all AI techniques in use today follow either a connectionist technique (roughly like the brain) or a Darwinian technique, or some combination of the two.
    2
  28. What's the curve of annual arctic sea-ice mass over the last 20 years?
    2
  29. Youtube shows a transcript (at least, for some of the vids).
    2
  30. My favorite of her thumbnails is the one where she wears the tinfoil hat.
    2
  31. An energetic particle must have knocked it out.
    2
  32. It does not have to be out there anywhere. We could be first. Someone has to be first; why not us?
    2
  33. If someone is comparing "how big an elephant that is" to "how big a mouse that is", would that be a comparison on absolute size?
    2
  34.  @subplantant  I can't articulate reasoning, with any certainty or in convincing terms, for a shade of difference in meaning between "how big a ..." and "how big of a ...". But I am a native speaker (US), and I do use the "of" usage. I think it emphasizes the idea that we are talking about size relative to what is typical for the kind of thing indicated by what follows the "of a", as opposed to absolute size.
    2
  35.  @subplantant  I don't know. I am still feeling sort of defensive, but your point could be valid.
    2
  36.  @subplantant  << Does it sound right to you to say "It's not big of a problem"? >> No. But "It's not too big of a problem." does.
    2
  37. I think what's in question is not whether most people need better privacy. They do, because society at large needs it. What's in question is whether VPNs actually provide the degrees of privacy and security that they claim.
    2
  38. I think it's moral confusion about what goals to pursue, when setting policy. For example, corporate profit should not take precedence over familial survival.
    2
  39. Build a wall around them.
    2
  40.  @duran9664  Evaporate does not mean disappear. It means get spread out more thinly. The model does not propose that energy disappears.
    2
  41. You're perceiving the point better than many of those commenting.
    2
  42. Or better than just salt-cooled, the designs that would put the fissionable in the form of a salt.
    2
  43. Stopping that is sufficient reason for the people to organize to depose the political rule of capital.
    2
  44. Breakthrough, unless you are talking about a friction device.
    2
  45.  Wesley  Where do you think is the boundary between the part of physics where common sense applies and the part where it misleads?
    2
  46.  Wesley  << Where the theories contradict each other because not all of them can be correct. >> No, I think there is reason to see that commonsense expectations break down earlier than where we get to the conflict between QM and GR, the theories that don''t agree with one another all the way down. These expectations break down in the Bell inequality, which comes up in straightforward QM, not going near GR.
    2
  47. If we're living in a simulation, all our study of nature is really just a study of the simulator's behavior as viewed from the inside. If I were ever convinced that the creators were talking to me, the first thing I'd ask is "what is nature really like?".
    2
  48. You summed it up pretty well.
    2
  49. OK, you know that GR as Einstein laid it out isn't quantum, right?
    2
  50. She is German. Expecting perfect mastery of a second language is too much.
    2