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Journal Article

On the No-Boundary Proposal for Ekpyrotic and Cyclic Cosmologies

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Lehners,  Jean-Luc
String Cosmology, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

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1407.4814.pdf
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JCAP2014_12_023.pdf
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Citation

Battarra, L., & Lehners, J.-L. (2014). On the No-Boundary Proposal for Ekpyrotic and Cyclic Cosmologies. Journal of Cosmology and Astroparticle Physics, 2014(12 ), 23-23. doi:10.1088/1475-7516/2014/12/023.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0024-7677-A
Abstract
The no-boundary proposal provides a compelling theory for the initial conditions of our universe. We study the implications of such initial conditions for ekpyrotic and cyclic cosmologies. These cosmologies allow for the existence of a new type of "ekpyrotic instanton", which describes the creation of a universe in the ekpyrotic contraction phase. Remarkably, we find that the ekpyrotic attractor can explain how the universe became classical. In a cyclic context, in addition to the ekpyrotic instantons there exist de Sitter-like instantons describing the emergence of the universe in the dark energy phase. Our results show that typically the ekpyrotic instantons yield a higher probability. In fact, in a potential energy landscape allowing both inflationary and cyclic cosmologies, the no-boundary proposal implies that the probability for ekpyrotic and cyclic initial conditions is vastly higher than that for inflationary ones.