Quantum Gates to other Universes
Résumé
We present a microscopic model of a bridge connecting two large Anti-de-Sitter Universes. The Universes admit a holographic description as three-dimensional N=4 supersymmetric gauge theories based on large linear quivers, and the bridge is a small rank-n gauge group that acts as a messenger. On the gravity side, the bridge is a piece of a highly-curved AdS5 × S5 throat carrying n units of five-form flux. We derive a universal expression for the mixing of the two massless gravitons: M2≃3n2(κ42+κ4′2)/16π2, where M is the mass splitting of the gravitons, κ42,κ4′2 are the effective gravitational couplings of the AdS4 Universes, and n is the quantized charge of the gate. This agrees with earlier results based on double-trace deformations, with the important difference that the effective coupling is quantized. We argue that the apparent non-localities of holographic double-trace theories are resolved by integrating-in the (scarce) degrees of freedom of the gate.