Is ADS Theory a Quantum Theory? Hawking's Bet and the ADS/CFT Equivalence

In summary, Hawking lost his bet with Preskill when he discovered the ADS/CFT equivalence. The AdS/CFT correspondence remains a conjecture, though one that has extremely strong support. On another forum somebody tells me that ADS theory is also a quantum theory. Was it a quantum theory at that moment? in that case ADS was like CFT for unitarity.
  • #1
Heidi
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I read that he admitter having lost his bet with Preskill when he discovered the ADS/CFT equivalence.
I can understand that because CFT is a quantum theory in which evolution is unitary (but there is the problem of measurements). so the black holes can be described with unitary tools.
On another forum somebody tells me that ADS theory is also a quantum theory.
Was it a quantum theory at that moment? in that case ADS was like CFT for unitarity.
 
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  • #2
AdS is a classical theory of gravity, and refers to asymptotically AdS spacetimes of Einstein's general relativity.
The AdS/CFT correspondence remains a conjecture, though one that has extremely strong support.
The CFT is a quantum theory, and is thought to be equivalent to a string theory, which is also a quantum theory.
At low energies, the string theory is well described by classical AdS gravity.
 
  • #3
So what was the principal argrument that conviced Hawking?
it seems that it was the equivalent argument. but if gereral relativity (with black holes) was well described at low energy by the quantum symmetry he had the unitarity element in mind. this do not neek the equivalence.
Is it the T duality argument in the equivalence?
Does low energy prevents having black holes?
 
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  • #4
Heidi said:
On another forum somebody tells me that ADS theory is also a quantum theory.
Was it a quantum theory at that moment? in that case ADS was like CFT for unitarity.
In this context, AdS refers to string theory on AdS background. String theory is a quantum theory, and it always was.
 
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  • #5
Heidi said:
Is it the T duality argument in the equivalence?
No.
 
  • #6
atyy said:
The AdS/CFT correspondence remains a conjecture, though one that has extremely strong support.
Well, "extremely" may not be the best word. In my opinion, the main problem is the bulk reconstruction problem, namely how to reconstruct the bulk theory from the boundary theory, for which the existing results are not so "extremely" convincing.
 
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  • #7
@Demystifier
If it not the T duality which convinced Hawking what was it?
(string theory on Ads space is a quantum theory)
 
  • #8
Heidi said:
@Demystifier
If it not the T duality which convinced Hawking what was it?
(string theory on Ads space is a quantum theory)
AdS/CFT duality is what convinced him, but this answer will probably not satisfy you because this duality is just a conjecture. Perhaps you really want to ask why Hawking was convinced that AdS/CFT duality is true. I don't know. Many string theorists are convinced that AdS/CFT duality is true, but Hawking was not exactly a string theorist.
 
  • #9
I would like to understant why this correspondance between two quantum theories with unitary evolution convinced him that black holes may be described with a unitary evolution
He had them before separately. what does this add for him ?
 
  • #10
Heidi said:
I would like to understant why this correspondance between two quantum theories with unitary evolution convinced him that black holes may be described with a unitary evolution
He had them before separately. what does this add for him ?
Here is the logic. The CFT theory is something that is well understood and clearly unitary. Quantum gravity, on the other hand, is something that we don't understand well. Not even Hawking thought that he understands quantum gravity well. Since we don't understand quantum gravity, we cannot tell with certainty whether it is unitary or not. So quantum gravity could be a non-unitary theory, in which case the evolution of black holes could be non-unitary. But AdS/CFT correspondence claims that quantum gravity on AdS background is equivalent to CFT. If that claim is true (which we don't know with certainty), then it implies that black holes on AdS background are in fact unitary. If so, then it seems reasonable to believe that black holes on different backgrounds (not only on the AdS background) are also unitary, even if other backgrounds are even less well understood.
 
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  • #11
So Hawking was wrong. Information isn,t destroyed. Information gets entangled on the boundary of a hole with Hawking radiation. The exactly same matter as seen from an infalling view gets entangled too. The i falling takes a small time while we on the outside see the same matter fall forever (to get frozen on the boundary).
 

Related to Is ADS Theory a Quantum Theory? Hawking's Bet and the ADS/CFT Equivalence

1. What is Hawking's bet?

Hawking's bet refers to a bet made by renowned physicist Stephen Hawking in 1997, where he bet that the Higgs boson particle would never be found. This bet was based on his belief that the particle would not be found due to the difficulty in detecting it at the time.

2. What is ADS theory?

ADS theory, also known as the Anti-de Sitter/Conformal Field Theory correspondence, is a theoretical framework in physics that describes the relationship between gravity in a higher dimensional space and a conformal field theory on the boundary of that space. This theory has been used to study the properties of black holes and has also been applied to other areas of physics such as condensed matter physics.

3. What was the outcome of Hawking's bet?

In 2012, the Higgs boson particle was discovered by the Large Hadron Collider, proving Hawking's bet wrong. However, Hawking was happy to lose the bet as it meant that a new particle had been discovered and our understanding of the universe had been expanded.

4. How does ADS theory relate to Hawking's bet?

ADS theory played a role in Hawking's bet as it was one of the theories that was used to explain why the Higgs boson particle may not be found. The theory suggested that the particle may not exist in our three-dimensional world, but rather in a higher dimensional space, making it difficult to detect.

5. What are the implications of Hawking's bet and ADS theory?

The implications of Hawking's bet and ADS theory are that even the most brilliant scientists can be proven wrong, and that our understanding of the universe is constantly evolving. It also highlights the importance of theoretical frameworks, such as ADS theory, in guiding scientific research and discovery.

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