AdS/CFT and the cosmological constant problem

Understand

Within the context of the AdS/CFT correspondence we attempt to formulate the cosmological constant problem in the dual conformal field theory.

• The fine-tuning of the bulk cosmological constant is related to an apparent fine-tuning in the effective description of the CFT in terms of its light operators: while the correlators of single particle operators satisfy a large N expansion, the expansion does not appear to be natural.
• Individual terms contributing to correlators have parametrically larger value than the one dictated by large N counting.
• The final 1/N suppression of correlators is achieved via delicate cancellations between such terms.