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- W4324374927 abstract "A bstract We discuss the possibility of entanglement islands in cosmological spacetimes with a general perfect fluid with an equation of state w . We find that flat universes with time-symmetric slices where the Hubble parameter vanishes always have islands on that slice. We then move away from such slices, considering still universes with a general perfect fluid. Under the local thermal equilibrium assumption, the comoving entropy density s c is constant. As a result, the conditions for an island become an inequality between the energy density (or Hubble parameter) and the temperature at some time of normalization. The consequences are that islands can exist for practically all fluids that are not radiation, i.e. w ≠ 1 / 3. We also discuss the ramifications of our results for universes with spatial curvature. Finally, we show that islands occur in the Simple Harmonic Universe model which has no classical singularity at the background level, in contrast to all previous examples where islands occurred only in space-times with singularities." @default.
- W4324374927 created "2023-03-16" @default.
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- W4324374927 date "2023-03-13" @default.
- W4324374927 modified "2023-09-25" @default.
- W4324374927 title "Islands in the fluid: islands are common in cosmology" @default.
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- W4324374927 doi "https://doi.org/10.1007/jhep03(2023)077" @default.
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