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2019

Islands outside the horizon

Almheiri, Ahmed, Mahajan, Raghu, Maldacena, Juan

Understand

We consider an AdS$_2$ black hole in equilibrium with a bath, which we take to have a dual description as (0+1)-dimensional quantum mechanical system coupled to a (1+1)-dimensional field theory serving as the bath.

We compute the entropies of both the quantum mechanical degrees of freedom and of the bath separately, while allowing contributions from entanglement wedge "islands".
We find situations where the island extends {\it outside} the black hole horizon.
This suggests possible causality paradoxes which we show are avoided because of the quantum focusing conjecture.