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On the Creation of the Universe via Ekpyrotic Instantons

We present a new class of complex instantons in the context of ekpyrotic cosmological theories. These instantons, which satisfy the "no-boundary" boundary conditions, describe the emergence of a classical, contracting universe out of nothing. The ekpyrotic attractor is essential in guaranteeing an evolution towards a real, Lorentzian history of the universe. In the context of the no-boundary proposal, the relative probability for such ekpyrotic histories compared to inflationary ones is very high -- in fact, assuming a bounce can be incorporated, these new instantons currently describe the most likely origin of the universe.

preprint2014arXivOpen access
Lorenzo BattarraJean-Luc Lehners
astro-ph.COgr-qchep-th
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Lorenzo BattarraJean-Luc Lehners

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