Abstract
Stationary observers in static spacetimes see falling objects spread exponen-tially fast, or fast-scramble, near event horizons. We generalize this picture to arbitrary cosmological horizons. We give examples of exponential fast-scrambling and power-law scrambling and “de-scrambling” as charges propagate freely near a horizon. In particular we show that when the universe is decelerating, information hidden behind the apparent horizon is de-scrambled as it re-enters the view of the observer. In contrast to the de Sitter case, the power-law scaling suggests that the microscopic dynamics of the horizon are local.
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Carney, D., Fischler, W. Decelerating cosmologies are de-scramblers. J. High Energ. Phys. 2015, 43 (2015). https://doi.org/10.1007/JHEP08(2015)043
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DOI: https://doi.org/10.1007/JHEP08(2015)043