Physical Interpretation of Gibbons–Hawking Entropy

Ascertain which side of the cosmological horizon is accounted for by the Gibbons–Hawking entropy in de Sitter spacetime and clarify its thermodynamic interpretation in observer-dependent settings.

Background

While black hole entropy naturally counts exterior ignorance of the interior, the cosmological horizon is observer-dependent, complicating the interpretation of Gibbons–Hawking entropy. The thesis notes that outside static patch holography it is unclear whether the entropy refers to the interior or exterior side of the horizon.