Thread

Gravity seems holographic. What does that mean for reality?

300 points · 234 comments · ibobev

VyseofArcadia · 1790359458 · focus · HN ↗
Mathematician, not physicist, but it seems reasonable to me that you could encode a sufficiently constrained 3D space on a 2D boundary. And if you have such an encoding, it also doesn't seem insane that some things might be more easily modeled on the 2D boundary than the 3D space.
If you can convert back and forth between a 2D representation and a 3D representation, and different phenomena are more easily modeled in each, does it matter which is "real"? Unless of course you can come up with a specific prediction and experiment to test it.
1. wormius · 1790362243 · focus · HN ↗
  Yeah, there's a great talk about the physics of the holographic information encoded on the surface by Raphael Bousso (if you have an hour):
  <a href="https://www.youtube.com/watch?v=GHgi6E1ECgo" rel="nofollow">https://www.youtube.com/watch?v=GHgi6E1ECgo
  HIGHLY recommend it for lay folks interested in this stuff. Which reminds me, I should yt-dl this so it's not lost, and I have a copy...
  1. LargoLasskhyfv · 1790374172 · focus · HN ↗
    In 240p only? :-(
    einsteinx2 · 1790374868 · focus · HN ↗
    The YouTube video was uploaded 18 years ago, and looks like it was filmed on a VHS camcorder. I guess it could have been 480p as the original would have been 480i, but it wouldn’t look all that much better.
    ronsor · 1790377485 · focus · HN ↗
    VHS has an effective resolution of ~240p anyway.

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