In the $AdS_3/CFT_2$ correspondence, the central charge of the dual CFT2 is universally given by
$$
c = \frac{3\ell}{2G}
$$
This is independent of the matter in the bulk of AdS3. Is it also universal in the higher dimensional analogues $AdS_d/CFT_{d-1}$ or does it depend on details of the matter in the bulk, etc.?
In particular, what is the central charge for $d=4$?
This post imported from StackExchange Physics at 2014-06-11 20:44 (UCT), posted by SE-user Prahar