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Horizon entropy from quantum gravity condensates

MPS-Authors
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Oriti,  Daniele
Microscopic Quantum Structure & Dynamics of Spacetime, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

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Pranzetti,  Daniele
Microscopic Quantum Structure & Dynamics of Spacetime, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

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Sindoni,  Lorenzo
Microscopic Quantum Structure & Dynamics of Spacetime, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

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Fulltext (public)

1510.06991.pdf
(Preprint), 462KB

1510.06991v2.pdf
(Preprint), 416KB

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Citation

Oriti, D., Pranzetti, D., & Sindoni, L. (2016). Horizon entropy from quantum gravity condensates. Physical Review Letters, 116: 211301. doi:10.1103/PhysRevLett.116.211301.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0028-FE66-4
Abstract
We construct condensate states encoding the continuum spherically symmetric quantum geometry of an isolated horizon in full quantum gravity, i.e. without any classical symmetry reduction, in the group field theory formalism. Tracing over the bulk degrees of freedom, we show how the resulting reduced density matrix manifestly exhibits an holographic behavior. We derive a complete orthonormal basis of eigenstates for the reduced density matrix of the horizon and use it to compute the horizon entanglement entropy. By imposing consistency with the isolated horizon boundary conditions and semi-classical thermodynamical properties, we recover the Bekenstein--Hawking entropy formula for any value of the Immirzi parameter. Our analysis supports the equivalence between the von Neumann (entanglement) entropy interpretation and the Boltzmann (statistical) one.