# What does AdS/CFT have to say about quantum gravity in our world?

The Ads side of the AdS/CFT correspondence is a model of quantum gravity in 5 dimensional antidesitter space. What can it say about quantum gravity in our 4-spacetime dimensions? Or is it just a toy model to better our understanding of quantum gravity as a whole?

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The original Manldacena proposal is actually in 10-dimensions (critical superstring theory) where 5 of them are compactified (I think that the flux of higher form fields in the compactified dimensions play an important role, so its not enough to only keep the non-compact dimensions). Furthermore the duality can be generalized to other dimensions, 5 is not that special in this regard. There is for example a lot of work on $AdS_3/CFT_2$ holographic dualities these days.