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A new kind of cyclic universe

Author(s): Ijjas, Anna; Steinhardt, Paul J.

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Abstract: Combining intervals of ekpyrotic (ultra-slow) contraction with a (non-singular) classical bounce naturally leads to a novel cyclic theory of the universe in which the Hubble parameter, energy density and temperature oscillate periodically, but the scale factor grows by an exponential factor from one cycle to the next. The resulting cosmology not only resolves the homogeneity, isotropy, flatness and monopole problems and generates a nearly scale invariant spectrum of density perturbations, but it also addresses a number of age-old cosmological issues that big bang inflationary cosmology does not. There may also be wider-ranging implications for fundamental physics, black holes and quantum measurement.
Publication Date: 5-Jul-2019
DOI: doi:10.1016/j.physletb.2019.06.056
ISSN: 0370-2693
Keywords: cyclic universe, cosmological bounce, ekpyrotic contraction
Language: en
Type of Material: Journal Article
Journal/Proceeding Title: Physics Letters B
Version: Final published version. This is an open access article.

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