Comments by "Lepi Doptera" (@lepidoptera9337) on "Physics and the meaning of life PART 1 | Sabine Hossenfelder" video.

  1. The actual problem you have with theoretical physics is that you are too lazy to learn about it. ;-)
    1
  2.  @angelmujahid2233  Why does a fact suddenly become an ad hominem attack? How much time did you spend on learning theoretical physics? Among physicists eight years 24/7 is considered the theoretical minimum. An experienced theorist will have 20-30 years of full time experience or more. ;-)
    1
  3. You know what they say... if you can't do teach. Well, she can't even teach. That's why she trolls. :-)
    1
  4. No. ;-)
    1
  5. You can see this in a spacetime (Minkovski) diagram if you wish. The principle of relativity says (among other things) that all observers are equally competent and that their observations have to be treated as equally valid. For spacelike separated events (that are not in causal contact), we can find observers which will observe A before B and others which will observe B before A. And somewhere between those two is an observer for whom A and B seem to be happening at the same time. What all of these observers can agree on is that there can be no causal contact between A and B. Nature could have chosen a cacophony of causal dependences, but it didn't. It implements exactly three classes of causal relationships that are roughly (A may cause B), (B may cause A) and (neither can cause the other). On a slightly deeper level this destroys any notion of simultaneity in different locations. See the "Andromeda Paradox" and the "Rietdijk–Putnam argument". Personally I find the lack of simultaneity the hardest to "grok", but that's probably a personal shortcoming of my intuition.
    1