# de Sitter entropy as entanglement

Source: [de Sitter entropy as entanglement](<https://www.sota2.com/research/paper/68fa3b441e209131ce8d160e>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-25T00:31:02.322Z

Authors: K. Narayan

Published: 2019-04-02T05:32:36.000Z

## Abstract

We describe connected timelike codim-2 extremal surfaces stretching between the future and the past boundaries in the static patch coordinatization of de Sitter space. These are analogous to rotated versions of certain surfaces in the $AdS$ black hole. The existence of these surfaces via the $dS/CFT$ framework suggests the speculation that $dS\_4$ is dual to two copies of ghost-like CFTs in a thermofield-double-type entangled state. In studies of entanglement in ghost systems and "ghost-spin" chains, we show that similar entangled states in two copies of ghost-spin ensembles always have positive norm and positive entanglement.

## Recorded benchmark results

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/1904.01223>)

[PDF](<https://arxiv.org/pdf/1904.01223.pdf>)