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The No-Boundary Measure in the Regime of Eternal Inflation

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If you have a question about this talk, please contact Baojiu Li.

In a quantum universe, the wave function of the universe provides a measure on the space of all classical histories of the universe. This can be used to obtain predictions for local observations.

We discuss several properties of the histories predicted by Hartle and Hawking’s no-boundary wave function and show in particular this selects inflationary universes. In matter models that have a parameter regime where the conditions for eternal inflation are satisfied, the predicted amount of inflation of our universe is large. This generates a spectrum of perturbations whose non-Gaussian features provide a potentially observable signature of the quantum state.

This talk is part of the Theoretical Physics Colloquium series.

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