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TLDR: [...] the holographic principle allows physicists to study gravitational systems by projecting them on a boundary [...] proved that symmetry is not

TLDR: [...] the holographic principle allows physicists to study gravitational systems by projecting them on a boundary [...] proved that symmetry is not possible in a gravitational theory if it obeys the holographic principle. [...] meaning that symmetry would not be possible in quantum gravity.

deleted 7y ago
[deleted]
Khaine 7y ago
PBS Space Time have done a number of episodes on the holographic principle[1] I strongly recommend anyone interested in physics check out the channel [1] https://www.youtube.com/watch?v=klpDHn8viX8 https://www.youtube.com/watch?v=klpDHn8viX8
RandomBacon 7y ago
For people on a mobile device: > TLDR: > the holographic principle allows physicists to study gravitational systems by projecting them on a boundary > proved that symmetry is not possible in a gravitational theory if it obeys the holographic principle. > meaning that symmetry would not be possible in quantum gravity.
- foobar1962 7y ago
  ... if it obeys the holographic principle.
hinkley 7y ago
By inference. this means we trust the holographic principle so thoroughly that we don't even consider that it could be the unbalanced part of this equation. Is that true?
- TheOtherHobbes 7y ago
  AdS/CFT fell out of string theory. It's only holographic in the sense that in some circumstances you can summarise an n=dimensional system using n-1 dimensions - not in the literal sense of using the kind of optical transforms that make visual holography possible, but in the more abstract sense that all of the information in some spaces ends up on a notional surrounding boundary. The AdS universe is basically a mathematical toy for physicists to play with. It doesn't correspond with the physical structure of the real universe. There's a hope that it might correspond to some kind of mathematical meta-structure that defines physical laws. This article suggests that's very unlikely. Personally I wouldn't be surprised if AdS/CFT turned out to be a dead end - probably like supersymmetry - and the real structure of quantum gravity turned out to be completely different and unexpected, and not a Conformal Field Theory at all. But IANAP, so I may well be wrong about that.

deleted 7y ago

[deleted]

Khaine 7y ago

PBS Space Time have done a number of episodes on the holographic principle[1] I strongly recommend anyone interested in physics check out the channel [1] https://www.youtube.com/watch?v=klpDHn8viX8 https://www.youtube.com/watch?v=klpDHn8viX8

RandomBacon 7y ago

For people on a mobile device: > TLDR: > the holographic principle allows physicists to study gravitational systems by projecting them on a boundary > proved that symmetry is not possible in a gravitational theory if it obeys the holographic principle. > meaning that symmetry would not be possible in quantum gravity.

foobar1962 7y ago
... if it obeys the holographic principle.

hinkley 7y ago

By inference. this means we trust the holographic principle so thoroughly that we don't even consider that it could be the unbalanced part of this equation. Is that true?

TheOtherHobbes 7y ago
AdS/CFT fell out of string theory. It's only holographic in the sense that in some circumstances you can summarise an n=dimensional system using n-1 dimensions - not in the literal sense of using the kind of optical transforms that make visual holography possible, but in the more abstract sense that all of the information in some spaces ends up on a notional surrounding boundary. The AdS universe is basically a mathematical toy for physicists to play with. It doesn't correspond with the physical structure of the real universe. There's a hope that it might correspond to some kind of mathematical meta-structure that defines physical laws. This article suggests that's very unlikely. Personally I wouldn't be surprised if AdS/CFT turned out to be a dead end - probably like supersymmetry - and the real structure of quantum gravity turned out to be completely different and unexpected, and not a Conformal Field Theory at all. But IANAP, so I may well be wrong about that.