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Journal Article

Area Law from Loop Quantum Gravity


Zhang,  Mingyi
MPI for Gravitational Physics, Max Planck Society;

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Hamma, A., Hung, L.-Y., Marciano, A., & Zhang, M. (2018). Area Law from Loop Quantum Gravity. Physical Review D, 97: 064040. doi:10.1103/PhysRevD.97.064040.

Cite as: https://hdl.handle.net/21.11116/0000-0001-42A3-C
We explore the constraints following from requiring the Area Law in the entanglement entropy in the context of loop quantum gravity. We find a unique solution to the single link wave-function in the large j limit, believed to be appropriate in the semi-classical limit. We then generalize our considerations to multi-link coherent states, and find that the area law is preserved very generically using our single link wave-function as a building block. Finally, we develop the framework that generates families of multi-link states that preserve the area law while avoiding macroscopic entanglement, the space-time analogue of "Schroedinger cat". We note that these states, defined on a given set of graphs, are the ground states of some local Hamiltonian that can be constructed explicitly. This can potentially shed light on the construction of the appropriate Hamiltonian constraints in the LQG framework.