Abstract
We compute exact three and four point functions in the W\_N minimal models
that were recently conjectured to be dual to a higher spin theory in AdS\_3. The
boundary theory has a large number of light operators that are not only
invisible in the bulk but grow exponentially with N even at small conformal
dimensions. Nevertheless, we provide evidence that this theory can be
understood in a 1/N expansion since our correlators look like free-field
correlators corrected by a power series in 1/N . However, on examining these
corrections we find that the four point function of the two bulk scalar fields
is corrected at leading order in 1/N through the contribution of one of the
additional light operators in an OPE channel. This suggests that, to correctly
reproduce even tree-level correlators on the boundary, the bulk theory needs to
be modified by the inclusion of additional fields. As a technical by-product of
our analysis, we describe two separate methods -- including a Coulomb gas type
free-field formalism -- that may be used to compute correlation functions in
this theory.
Users
Please
log in to take part in the discussion (add own reviews or comments).