Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2005-11-04
JHEP0602:006,2006
Physics
High Energy Physics
High Energy Physics - Theory
18 pages, minor changes, references added. Version accepted by JHEP
Scientific paper
10.1088/1126-6708/2006/02/006
We present general methods to study the effect of multitrace deformations in conformal theories admitting holographic duals in Anti de Sitter space. In particular, we analyse the case that these deformations introduce an instability both in the bulk AdS space and in the boundary CFT. We also argue that multitrace deformations of the O(N) linear sigma model in three dimensions correspond to nontrivial time-dependent backgrounds in certain theories of infinitely many interacting massless fields on AdS_4, proposed years ago by Fradkin and Vasiliev. We point out that the phase diagram of a truly marginal large-N deformation has an infrared limit in which only an O(N) singlet field survives. We draw from this case lessons on the full string-theoretical interpretation of instabilities of the dual boundary theory and exhibit a toy model that resolves the instability of the O(N) model, generated by a marginal multitrace deformation. The resolution suggests that the instability may not survive in an appropriate UV completion of the CFT.
Elitzur Shmuel
Giveon Amir
Porrati Massimo
Rabinovici Eliezer
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