Bouncing unitary cosmology II. Mini-superspace phenomenology

Gryb, S. & Thebault, K. P. Y., 7-Feb-2019, In : Classical and Quantum Gravity. 36, 3, 33 p., 035010.

Research output: Contribution to journalArticleAcademicpeer-review

Copy link to clipboard


  • Bouncing unitary cosmology II. Mini-superspace phenomenology

    Final publisher's version, 3 MB, PDF document

    Request copy


A companion paper provides a proposal for cosmic singularity resolution based upon general features of a bouncing unitary cosmological model in the mini-superspace approximation. This paper analyses novel phenomenology that can be identified within particular solutions of that model. First, we justify our choice of particular solutions based upon a clearly articulated and observationally-motivated principle. Second, we demonstrate that the chosen solutions follow a classical mini-superspace cosmology before smoothly bouncing off the classically singular region. Third, and most significantly, we identify a 'Rayleigh-scattering' limit for physically reasonable choices of parameters within which the solutions display effective behaviour that is insensitive to the details of rapidly oscillating Planck-scale physics. This effective physics is found to be compatible with an effective period of cosmic inflation well below the Planck scale. The detailed effective physics of this Rayleigh-scattering limit is provided via: (i) an exact analytical treatment of the model in the de Sitter limit; and (ii) numerical solutions of the full model.

Original languageEnglish
Article number035010
Number of pages33
JournalClassical and Quantum Gravity
Issue number3
Publication statusPublished - 7-Feb-2019


  • quantum cosmology, singularity resolution, cosmological constant, problem of time, bouncing cosmology, QUANTUM, EVOLUTION

ID: 118754295