Islands in cosmology
By Thomas Hartman, Yikun Jiang, Edgar Shaghoulian. Journal of High Energy Physics, 2020
168 citations recorded by the source corpus.
A quantum extremal island suggests that a region of spacetime is encoded in the quantum state of another system, like the encoding of the black hole interior in Hawking radiation. We study conditions for islands to appear in general spacetimes, with or without black holes. They must violate Bekenstein’s area bound in a precise sense, and the boundary of an island must satisfy several other information-theoretic inequalities. These conditions combine to impose very strong restrictions, which we apply to cosmological models. We find several examples of islands in crunching universes. In particular, in the four-dimensional FRW cosmology with radiation and a negative cosmological constant, there is an island near the turning point when the geometry begins to recollapse. In a two-dimensional model of JT gravity in de Sitter spacetime, there are islands inside crunches that are encoded at future infinity or inside bubbles of Minkowski spacetime. Finally, we discuss simple tensor network toy models for islands in cosmology and black holes.
Subfields: Mathematical Physics, Nuclear and High Energy Physics, Statistical and Nonlinear Physics
View Paper: https://www.semanticscholar.org/paper/3e97b2779605932d9e8a493ffa098f3f31199ce7
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Citations in the corpus
- Information Transfer with a Gravitating Bath (2020, background): “It deserves to be mentioned that we can construct entanglement islands in a massless theory of gravity without any information paradoxes to start with [16–18].”
- Inconsistency of islands in theories with long-range gravity (2021, methodology): “In figure 13 of [103] for instance, the independent degrees of freedom of the gravitational system should be associated only with the “tip” of the Penrose diagram at spatial infinity, and one can neither send nor receive signals from spatial infinity.”
- Quantum extremal islands made easy. Part II. Black holes on the brane (2020, background): “This approach has now also been applied in a variety of different situations involving black holes [22–50] and cosmology [51–58].”