5 ms·

Is the Universe a Hologram?

77 points by jaboutboul 12y ago

shasta 12y ago
> They are negatively curved, any object thrown away on a straight line will eventually return. Isn't that describing positive curvature (e.g. a sphere)?
- chisleu 12y ago
  The inside of a sphere. http://i.imgur.com/b2KgM6X.gifv http://i.imgur.com/b2KgM6X.gifv
  - MrJagil 12y ago
    That was really interesting, do you have a source? (The title makes it seem like a joke though)
    - mungoman2 12y ago
      Google Hollow Earth. There are many conspiracy theory sites handling it, but I think it is a quite interesting concept nontheless.
- sukilot 12y ago
  No, paraboloid also has positive curvature. Sign of curvature refers to whether all curves at a point are in the same half-space (saddles have negative curvature). OP really means something like "eccentricity <1"
estrabd 12y ago
Again with the fuckin' chickin?!
pje 12y ago
http://en.wikipedia.org/wiki/Betteridge%27s_law_of_headlines http://en.wikipedia.org/wiki/Betteridge%27s_law_of_headlines
- josephpmay 12y ago
  I don't think it really applies in this case? It's pointing out a new scientific theory that raises a question. The author isn't poising a question him/herself
deleted 12y ago
[deleted]
karmakaze 12y ago
Sure, it's one interpretation and a solution to the Black hole information paradox. But I don't like to talk about space without time, preferring this solution http://en.wikipedia.org/wiki/Black_hole_information_paradox#Information_is_encoded_in_the_correlations_between_future_and_past.5B14.5D.5B15.5D http://en.wikipedia.org/wiki/Black_hole_information_paradox#...
- bitism 12y ago
  You can talk about space without time though you can't talk about changes of information (i.e.: movement through space) without time.
bitism 12y ago
It From Bit : )
- gloriousduke 12y ago
  Wheelerian thought should never be down-voted.
blazespin 12y ago
The universe is just a projection of a massive Turing machine two dimensions, time and tape.
pikachu_is_cool 12y ago
Your mom's a hologram.
carrotleads 12y ago
someone once told me, the Universe is someone's dream. When we dream, is it in 2d or 3D ?
- pluma 12y ago
  Memory is in 3rd person. This is entirely irrelevant.
z3t4 12y ago
What will happen when photons reach the outer boundary of the universe? Where time and space starts to slow down ... Will the photon also slow down, and then take an elliptic path? Might explain why the universe seem to expand in all directions.
dools 12y ago
Anyone interested in this can find an excellent lecture here http://m.youtube.com/watch?v=dEaecUuEqfc http://m.youtube.com/watch?v=dEaecUuEqfc and of course by looking up leonard susskind's stuff on the black hole wars and universe as a hologram
- jaboutboul 12y ago
  yes leonard susskind's stuff on this is excellent!
gii2 12y ago
Why it should be 2D? Three-dimensional hologram would totally works for us. Something like The Matrix and 13th Floor combined... You have everything in 3D around you and just a tiny part of the Universe (where you are currently looking at), because it is not possible to simulate the full Universe (the energy since the Big Bang till now won't be enough).
- dennisnedry 12y ago
  All holograms only have 2 dimensions. They "trick" us into thinking the image you are seeing in the hologram has 3 dimensions. The idea behind the Universe being a hologram is that everything exists in flat space; however, it appears to us as being in 3 dimensions. Think of a video game, where you are moving around in a 3d world, but it's not really 3d, it just "feels" like it is.
  - saiya-jin 12y ago
    ever been diving? feels pretty much as 3D as you would expect
krylon 12y ago
It's funny how some of the more advanced cosmological theories sound as if they came straight from the minds of stoned teenagers. To wit: http://en.wikipedia.org/wiki/One-electron_universe http://en.wikipedia.org/wiki/One-electron_universe The universe is a strange place indeed.

77 points by jaboutboul 12y ago

> They are negatively curved, any object thrown away on a straight line will eventually return. Isn't that describing positive curvature (e.g. a sphere)?

chisleu 12y ago
The inside of a sphere. http://i.imgur.com/b2KgM6X.gifv http://i.imgur.com/b2KgM6X.gifv
- MrJagil 12y ago
  That was really interesting, do you have a source? (The title makes it seem like a joke though)
  - mungoman2 12y ago
    Google Hollow Earth. There are many conspiracy theory sites handling it, but I think it is a quite interesting concept nontheless.
sukilot 12y ago
No, paraboloid also has positive curvature. Sign of curvature refers to whether all curves at a point are in the same half-space (saddles have negative curvature). OP really means something like "eccentricity <1"

estrabd 12y ago

Again with the fuckin' chickin?!

pje 12y ago

http://en.wikipedia.org/wiki/Betteridge%27s_law_of_headlines http://en.wikipedia.org/wiki/Betteridge%27s_law_of_headlines

josephpmay 12y ago
I don't think it really applies in this case? It's pointing out a new scientific theory that raises a question. The author isn't poising a question him/herself

deleted 12y ago

[deleted]

karmakaze 12y ago

Sure, it's one interpretation and a solution to the Black hole information paradox. But I don't like to talk about space without time, preferring this solution http://en.wikipedia.org/wiki/Black_hole_information_paradox#Information_is_encoded_in_the_correlations_between_future_and_past.5B14.5D.5B15.5D http://en.wikipedia.org/wiki/Black_hole_information_paradox#...

bitism 12y ago
You can talk about space without time though you can't talk about changes of information (i.e.: movement through space) without time.

bitism 12y ago

It From Bit : )

gloriousduke 12y ago
Wheelerian thought should never be down-voted.

blazespin 12y ago

The universe is just a projection of a massive Turing machine two dimensions, time and tape.

pikachu_is_cool 12y ago

Your mom's a hologram.

carrotleads 12y ago

someone once told me, the Universe is someone's dream. When we dream, is it in 2d or 3D ?

pluma 12y ago
Memory is in 3rd person. This is entirely irrelevant.

z3t4 12y ago

What will happen when photons reach the outer boundary of the universe? Where time and space starts to slow down ... Will the photon also slow down, and then take an elliptic path? Might explain why the universe seem to expand in all directions.

dools 12y ago

Anyone interested in this can find an excellent lecture here http://m.youtube.com/watch?v=dEaecUuEqfc http://m.youtube.com/watch?v=dEaecUuEqfc and of course by looking up leonard susskind's stuff on the black hole wars and universe as a hologram

jaboutboul 12y ago
yes leonard susskind's stuff on this is excellent!

gii2 12y ago

Why it should be 2D? Three-dimensional hologram would totally works for us. Something like The Matrix and 13th Floor combined... You have everything in 3D around you and just a tiny part of the Universe (where you are currently looking at), because it is not possible to simulate the full Universe (the energy since the Big Bang till now won't be enough).

dennisnedry 12y ago
All holograms only have 2 dimensions. They "trick" us into thinking the image you are seeing in the hologram has 3 dimensions. The idea behind the Universe being a hologram is that everything exists in flat space; however, it appears to us as being in 3 dimensions. Think of a video game, where you are moving around in a 3d world, but it's not really 3d, it just "feels" like it is.
- saiya-jin 12y ago
  ever been diving? feels pretty much as 3D as you would expect

krylon 12y ago

It's funny how some of the more advanced cosmological theories sound as if they came straight from the minds of stoned teenagers. To wit: http://en.wikipedia.org/wiki/One-electron_universe http://en.wikipedia.org/wiki/One-electron_universe The universe is a strange place indeed.