# The classical limit of AdS/CFT

1. Jan 7, 2015

### Demystifier

The AdS/CFT correspondence is a correspondence of one quantum theory to another quantum theory. But what about the classical limit of these two theories? Is there a correspondence between the corresponding classical theories? If there is, what a precise form this classical-to-classical correspondence takes?

2. Jan 7, 2015

### atyy

fzero commented on this in https://www.physicsforums.com/threa...-form-ways-it-could-fail.706159/#post-4479075. I don't understand it much, but here is his comment.

3. Jan 7, 2015

### Demystifier

Thanks atty, but I don't find in satisfying. For instance, one can certainly consider a classical gauge theory with small N (classical electrodynamics is an example), so I cannot accept the claim that classical limit is the large N limit. Indeed, the classical limit should be related to the Planck constant going to zero (in a suitable way), while the discussion above does not even mention the Planck constant.

Last edited: Jan 7, 2015