Abstract
We show that if the Universe expands forever, it will become increasingly irregular in the far future. In particular, we demonstrate that the Hawking black hole evaporation process causes a vortical instability to develop in spatially homogeneous spacetimes which are approximately k = 0 Friedmann universes. We associate the increase of irregularity with the increase of gravitational field entropy, and thus provide a novel picture of the universal heat death.
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Barrow, J., Tipler, F. Eternity is unstable. Nature 276, 453–459 (1978). https://doi.org/10.1038/276453a0
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DOI: https://doi.org/10.1038/276453a0
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