Open AdS/CFT via a Double Trace Deformation

TL;DR

This paper explores a model within AdS/CFT that couples a boundary quantum field theory to a bath via double-trace deformation, providing insights into quantum gravity and subregion physics in a gravitational universe.

Contribution

It introduces a concrete model using double-trace deformation to couple a CFT with a bath, shedding light on unitarity and subregion physics in AdS/CFT.

Findings

The model demonstrates full unitarity of the boundary theory.

It offers new insights into quantum aspects of AdS/CFT.

Potential applications in understanding subregion physics.

Abstract

A concrete model of extracting the physics from the bulk of a gravitational universe is important to the study of quantum gravity and its possible relationship with experiments. Such a model can be constructed in the AdS/CFT correspondence by gluing a bath on the asymptotic boundary of the bulk anti-de Sitter (AdS) spacetime. This bath models a laboratory and is described by a quantum field theory. In the dual conformal field theory (CFT) description this coupling is achieved by a double-trace deformation that couples the CFT with the bath. This suggests that the physics observed by the laboratory is fully unitary. In this paper, we analyze the quantum aspects of this model in detail which conveys new lessons about the AdS/CFT correspondence, and we discuss the potential usefulness of this model in understanding subregion physics in a gravitational universe.