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Location and Completeness of de Sitter Holographic Degrees of Freedom

Determine the placement of the holographic degrees of freedom in de Sitter spacetime and ascertain whether a holographic screen can encode the full spacetime, given the absence of a timelike boundary and of a global time.

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Background

In de Sitter space there is no timelike boundary and no global timelike Killing vector, making the holographic dictionary far less direct than in AdS/CFT. The thesis highlights that these obstacles leave the location of the dual degrees of freedom and the completeness of a would-be screen description unsettled.

References

Because of these problems, it is far from clear where the holographic degrees of freedom should be located, and whether such a holographic screen encodes the whole spacetime.

— Information-theoretic constraints in quantum gravity and cosmology (2510.15787 - Franken, 17 Oct 2025) in Introduction, Section: Holography for cosmology