On the No-Boundary Proposal for Ekpyrotic and Cyclic Cosmologies - INSPIRE

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On the No-Boundary Proposal for Ekpyrotic and Cyclic Cosmologies

Jul 17, 2014

42 pages

Published in:

JCAP 12 (2014) 023

Published: Dec 11, 2014

e-Print:

1407.4814 [hep-th]

DOI:

10.1088/1475-7516/2014/12/023

View in:

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Abstract: (IOP)

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.

Note:

46 pages, 24 figures, v3: updated with version to be published in JCAP

alternatives to inflation
quantum cosmology
cosmological model: cyclic
cosmological model: ekpyrotic
boundary condition
instanton
inflation
attractor

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