https://doi.org/10.1140/epjc/s10052-025-14471-9
Regular Article - Theoretical Physics
The entropy of dynamical de Sitter horizons
School of Physics and Astronomy, Beijing Normal University, 100875, Beijing, China
Received:
5
May
2025
Accepted:
26
June
2025
Published online:
7
July
2025
We propose a new formula for the entropy of a dynamical cosmological event horizon, which is valid to leading order for perturbations of a stationary asymptotically de Sitter spacetime. By introducing a nontrivial correction term, we generalize Gibbons and Hawking’s first law of event horizons to non-stationary eras. We also develop the non-stationary physical process first law between two arbitrary horizon cross-sections for the cosmological event horizon.
© The Author(s) 2025
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