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Bulk Entanglement Gravity without a Boundary: Towards Finding Einstein's Equation in Hilbert Space
ChunJun Cao, Sean M. Carroll
We consider the emergence from quantum entanglement of spacetime geometry in a bulk region. For certain classes of quantum states in an appropriately factorized Hilbert space, a sp…
Branches of the Black Hole Wave Function Need Not Contain Firewalls
Ning Bao, Sean M. Carroll, Aidan Chatwin-Davies +2
We discuss the branching structure of the quantum-gravitational wave function that describes the evaporation of a black hole. A global wave function which initially describes a cla…
De Sitter Space as a Tensor Network: Cosmic No-Hair, Complementarity, and Complexity
Ning Bao, ChunJun Cao, Sean M. Carroll +1
We investigate the proposed connection between de Sitter spacetime and the MERA (Multiscale Entanglement Renormalization Ansatz) tensor network, and ask what can be learned via suc…
The Hilbert Space of Quantum Gravity Is Locally Finite-Dimensional
Ning Bao, Sean M. Carroll, Ashmeet Singh
We argue in a model-independent way that the Hilbert space of quantum gravity is locally finite-dimensional. In other words, the density operator describing the state corresponding…
A Nonlocal Approach to the Cosmological Constant Problem
Sean M. Carroll, Grant N. Remmen
We construct a model in which the cosmological constant is canceled from the gravitational equations of motion. Our model relies on two key ingredients: a nonlocal constraint on th…
Cosmic Equilibration: A Holographic No-Hair Theorem from the Generalized Second Law
Sean M. Carroll, Aidan Chatwin-Davies
In a wide class of cosmological models, a positive cosmological constant drives cosmological evolution toward an asymptotically de Sitter phase. Here we connect this behavior to th…