TY - JOUR

T1 - A new kind of cyclic universe

AU - Ijjas, Anna

AU - Steinhardt, Paul J.

N1 - Funding Information:
We thank J. Miralda-Escude, J. Ostriker. L. Page, J. Peebles and J. Simons for useful comments. A.I. is supported by the Simons Foundation ‘Origins of the Universe Initiative’ grant number 550202 . The work of P.J.S. is supported by the DOE grant number DEFG02-91ER40671 and by the Simons Foundation grant number 548512 .
Publisher Copyright:
© 2019 The Author(s)

PY - 2019/8/10

Y1 - 2019/8/10

N2 - 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.

AB - 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.

KW - Cosmological bounce

KW - Cyclic universe

KW - Ekpyrotic contraction

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U2 - 10.1016/j.physletb.2019.06.056

DO - 10.1016/j.physletb.2019.06.056

M3 - Article

AN - SCOPUS:85068573076

SN - 0370-2693

VL - 795

SP - 666

EP - 672

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

ER -