Bottom-up holographic models for cosmology

Abstract

In this note, we investigate some simple generalizations of a bottom-up holographic approach to cosmology introduced in arXiv:1810.10601. Our models utilize the Karch/Randall/Takayanagi ansatz for the gravitational dual of a boundary conformal field theory, involving pure AdS gravity and an end-of-the-world brane. Following a suggestion made in arXiv:2102.05057, we consider models with an additional interface brane in the bulk. We find that solutions with a viable cosmological interpretation exist only if our model is further generalized, for example by including an Einstein-Hilbert term in the ETW brane action. The physical validity of such models is discussed from the perspective of the effective theory.

arXiv commentMinor typos corrected in Section 3, and Appendices A and C

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• Bounds on gravitational brane couplings and tomography in AdS3 black hole microstates
• Holographic complexity: braneworld gravity versus the Lloyd bound
• Can one hear the shape of a wormhole?
• Cosmologies inside hyperbolic black holes
• Constraints from Entanglement Wedge Nesting for Holography at a Finite Cutoff
• Entanglement Entropy and Complexity of Multicomponent Universe from Holography