And for that matter, could our universe be inside a black hole?
  • BrooklynMan@lemmy.mlEnglish
    9·
    2 years ago

    tl:dr: possibly, but if so, it would be the size of the entire universe and, as a result, impossible for us to determine one way to the other.

      • i_love_FFT@lemmy.mlEnglish
        0·
        2 years ago

        Haha, yes! I’be had it on many websites and it took someone on Lemmy to notice :)

        • dizzy@lemmy.mlEnglish
          1·
          2 years ago

          Haha! I love them too! Super useful for audio applications.

          You might want to check out this lemmy instance if you’re into music production and audio stuff

          • i_love_FFT@lemmy.mlEnglish
            1·
            2 years ago

            Hehe, thanks I’ll have a look!

            I first learned about Fourier transforms during my bachelor in physics and hated it… Then, while doing my master’s in astrophysics I re-discovered it for data analysis and music, thus my username… 😁

    • ragica@lemmy.mlOPEnglish
      0·
      2 years ago

      Thanks for the interesting link. Can’t argue with Sean Carroll. Except of course for the people who do argue with Sean Carroll. Ha ha. But that’s way above my pay grade. But some do argue, even in the comments on that linked blog post. Sean’s responses there are of course also excellent and worth reading.

      • i_love_FFT@lemmy.mlEnglish
        1·
        2 years ago

        Yeah! I think this kind of question will end up being a question of definition for future generation of cosmologists…

        With the current definition, it seems the universe is not a black hole, but shares a lot of characteristics with them (except its singularity is in the past, but the future). If enough scientists like the idea of the universe being a black hole, they could simply modify the definition to allow “time-reversed black holes” as well, which seems to include the universe (if I understand correctly… My GR courses a far I’m my memory!)

  • Gsus4English
    3·
    2 years ago

    I didn’t find any ArXiv links in the page, but the main point is this: given how flat the Universe is, if it is inside a black hole, it needs to be really large in order to keep the curvature inside so flat.