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The Price of Curiosity: Information Recovery in de Sitter Space

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arxiv 2104.00006 v2 pith:3ZNWFQ4D submitted 2021-03-31 hep-th

The Price of Curiosity: Information Recovery in de Sitter Space

classification hep-th
keywords observerradiationsitterspaceappearscuriosityentropyfine-grained
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Recent works have revealed that quantum extremal islands can contribute to the fine-grained entropy of black hole radiation reproducing the unitary Page curve. In this paper, we use these results to assess if an observer in de Sitter space can decode information hidden behind their cosmological horizon. By computing the fine-grained entropy of the Gibbons-Hawking radiation in a region where gravity is weak we find that this is possible, but the observer's curiosity comes at a price. At the same time the island appears, which happens much earlier than the Page time, a singularity forms which the observer will eventually hit. We arrive at this conclusion by studying Jackiw-Teitelboim gravity in de Sitter space. We emphasize the role of the observer collecting radiation, breaking the thermal equilibrium studied so far in the literature. By analytically solving for the backreacted geometry we show how an island appears in this out-of-equilibrium state.

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