Beyond a = c : gravitational couplings to matter and the stress tensor OPE

Abstract

We derive constraints on the operator product expansion of two stress tensors in conformal field theories (CFTs), both generic and holographic. We point out that in large N CFTs with a large gap to single-trace higher spin operators, the stress tensor sector is not only universal, but isolated: that is, leftlangle TTmathcal{O}rightrangle =0 , where mathcal{O}ne T is a single-trace primary. We show that this follows from a suppression of leftlangle TTmathcal{O}rightrangle by powers of the higher spin gap, Δgap, dual to the bulk mass scale of higher spin particles, and explain why leftlangle TTmathcal{O}rightrangle is a more sensitive probe of Δgap than a − c in 4d CFTs. This result implies that, on the level of cubic couplings, the existence of a consistent truncation to Einstein gravity is a direct consequence of the absence of higher spins. By proving similar behavior for other couplings leftlangle T{mathcal{O}}_1{mathcal{O}}_2rightrangle where {mathcal{O}}_i have spin si ≤ 2, we are led to propose that 1/Δgap is the CFT “dual” of an AdS derivative in a classical action. These results are derived by imposing unitarity on mixed systems of spinning four-point functions in the Regge limit. Using the same method, but without imposing a large gap, we derive new inequalities on these three-point couplings that are valid in any CFT. These are generalizations of the Hofman-Maldacena conformal collider bounds. By combining the collider bound on TT couplings to spin-2 operators with analyticity properties of CFT data, we argue that all three tensor structures of 〈TTT〉 in the free-field basis are nonzero in interacting CFTs.