Emergent gravity from hidden sectors and TT deformations

Abstract

We investigate emergent gravity extending the paradigm of the AdS/CFT correspondence. The emergent graviton is associated to the (dynamical) expectation value of the energy-momentum tensor. We derive the general effective description of such dynamics, and apply it to the case where a hidden theory generates gravity that is coupled to the Standard Model. In the linearized description, generically, such gravity is massive with the presence of an extra scalar degree of freedom. The propagators of both the spin-two and spin-zero modes are positive and well defined. The associated emergent gravitational theory is a bi-gravity theory, as is (secretly) the case in holography. The background metric on which the QFTs are defined, plays the role of dark energy and the emergent theory has always as a solution the original background metric. In the case where the hidden theory is holographic, the overall description yields a higher-dimensional bulk theory coupled to a brane. The effective graviton on the brane has four-dimensional characteristics both in the UV and IR and is always massive.

72 pages plus appendices, minor errors corrected and several discussions clarified. References added

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• Anomalous and axial Z' contributions to g-2
• Emergent neutrinos from heavy messengers
• String (gravi)photons, "dark brane photons", holography and the hypercharge portal
• Holographic RG flows on Squashed $S^3$
• Light stringy states and the $g-2$ of the muon
• A hydrodynamical description of gravitational waves
• Geometric realization of stress-tensor deformed field theory
• Diffeomorphism Invariance Breaking in Gravity and Cosmological Evolution